All questions of Mineral & Power Resources for Class 8 Exam

The metal ores itself can be considered as a mineral. Some common metal minerals include Iron, Copper, Gold, Silver, etc. Non-Metallic Minerals do not contain metal elements in their inorganic chemical formula. Some common examples include; Clay, Diamond, Dolomite, Gypsum, Mica, Amethyst and Quartz, etc.

Limestone or calcium carbonate, CaCo3

The process of taking out minerals from rocks buried under the earth's surface is called mining. Minerals that lie at shallow depths are removed by removing the surface layer; this is known as open-cast mining. Deep bores, called shafts, have to be made to reach mineral deposits that lie at great depths.

Non-Metallic Mineral Fuels:

Non-metallic mineral fuels are those minerals that are used as fuels but do not contain any metal in them. They are important sources of energy and are used extensively in various industries. The two examples of non-metallic mineral fuels are:

1. Coal:
Coal is a black or brownish-black sedimentary rock that is formed from the remains of plants. It is one of the most important non-metallic mineral fuels and is used extensively as a source of energy. Coal is used in various industries such as power generation, cement production, and steel production. It is also used as a fuel for heating and cooking.

2. Petroleum:
Petroleum is a mixture of hydrocarbons that is found underground. It is a non-metallic mineral fuel that is also known as crude oil. Petroleum is used extensively in various industries such as transportation, power generation, and heating. It is also used as a raw material for the production of various products such as plastics, fertilizers, and chemicals.

Conclusion:
In conclusion, non-metallic mineral fuels are important sources of energy that are used extensively in various industries. The two examples of non-metallic mineral fuels are coal and petroleum. These minerals are important for the growth and development of industries and the economy.

Explanation:

Metallic minerals are minerals which contain one or more metallic elements. They occur in nature in a solid state and can be extracted from their ores by various methods. These minerals are the primary sources of metals like iron, copper, aluminum, zinc, nickel, gold, silver, etc.

Types of Metallic Minerals:

There are several types of metallic minerals, such as:

- Ferrous minerals: These minerals contain iron and include minerals like hematite, magnetite, limonite, and siderite.
- Non-ferrous minerals: These minerals do not contain iron and include minerals like copper, aluminum, zinc, lead, and gold.
- Precious metals: These metals are rare and valuable and include metals like gold, silver, and platinum.

Occurrence of Metallic Minerals:

Metallic minerals are found in different geological environments like igneous, sedimentary, and metamorphic rocks. Some of the common occurrences of metallic minerals are:

- Igneous rocks: Metallic minerals like copper, nickel, and platinum occur in igneous rocks like basalt and gabbro.
- Sedimentary rocks: Iron ore deposits are found in sedimentary rocks like shale, sandstone, and limestone.
- Metamorphic rocks: Metallic minerals like gold and silver occur in metamorphic rocks like quartzite and slate.

Extraction of Metals from Metallic Minerals:

Metals are extracted from metallic minerals by various methods like:

- Hydrometallurgy: This method involves the use of aqueous solutions to extract metals from their ores.
- Pyrometallurgy: This method involves the use of high temperatures to extract metals from their ores.
- Electrometallurgy: This method involves the use of electricity to extract metals from their ores.

Conclusion:

In conclusion, metallic minerals are the primary sources of metals and occur in nature in a solid state. They can be extracted from their ores by various methods like hydrometallurgy, pyrometallurgy, and electrometallurgy. They are found in different geological environments like igneous, sedimentary, and metamorphic rocks. Thus, option A is the correct answer as it contains metal in raw form.

Geothermal energy refers to the heat and electricity produced using the heat from the Earth’s interior. Geothermal energy refers to the heat and electricity produced by using the heat from the Earth’s interior. Groundwater in such areas absorbs heat from the rocks and becomes hot. It is so hot that when it rises to the earth’s surface, it turns into steam. This steam is used to drive turbines and generate electricity.

The biggest country in Europe produced more than 96 million tonnes of usable iron ore in 2018, out of which the iron content was estimated to be 56.7 million tonnes.

Geothermal energy is the heat that is generated and stored within the Earth. It is a renewable source of energy that can be harnessed and used for various purposes. One area where geothermal energy can be particularly useful is the Ladakh District.

Ladakh District, located in the northernmost part of India, is known for its extreme temperatures and challenging geographical conditions. The region experiences very cold winters and limited access to conventional sources of energy. In such a scenario, geothermal energy can play a crucial role in meeting the energy needs of the region.

Here's why geothermal energy is essential in Ladakh District:

1. Abundance of geothermal resources:
- Ladakh District is situated in the western Himalayas, which is a geologically active region. This means that there is a significant presence of geothermal resources in the area.
- The region is marked by hot springs, geysers, and volcanic activity, indicating the presence of geothermal energy reservoirs underground.

2. Reliable and continuous source of energy:
- Geothermal energy is available 24/7, unlike solar or wind energy, which are dependent on weather conditions.
- Ladakh District experiences prolonged winters with limited sunlight and harsh weather conditions, making solar and wind energy less reliable. Geothermal energy, on the other hand, can provide a consistent and reliable source of energy throughout the year.

3. Heating and electricity generation:
- Geothermal energy can be used for both heating and electricity generation.
- In Ladakh District, where extreme cold weather requires heating solutions, geothermal energy can be utilized for space heating in homes, offices, and other buildings.
- Additionally, geothermal power plants can be set up to generate electricity, which can help meet the energy demands of the region.

4. Environmental benefits:
- Geothermal energy is a clean and sustainable source of energy that produces very low greenhouse gas emissions.
- By relying on geothermal energy, Ladakh District can reduce its dependence on fossil fuels, leading to a significant reduction in air pollution and carbon footprint.

In conclusion, geothermal energy can serve as an essential source of energy in Ladakh District due to the abundance of geothermal resources, its reliability, versatility in heating and electricity generation, and environmental benefits. Harnessing geothermal energy can help address the energy needs of the region and contribute to a more sustainable and environmentally friendly energy system.

Non-ferrous minerals are those which do not have iron content in them. For example, copper, bauxite, lead, zinc, and gold.

In the 1970s, there was a growing interest in developing wind power primarily because of the oil crisis. The oil crisis of the 1970s was a result of political events, conflicts in the Middle East, and the Organization of Arab Petroleum Exporting Countries (OAPEC) oil embargo. This embargo led to a significant increase in oil prices and a shortage of petroleum products in many countries. As a result, there was a need to find alternative sources of energy to reduce dependence on oil.

The interest in wind power during this time can be attributed to the following factors:

1. Renewable and abundant resource: Wind is a renewable resource that is available in abundance. It does not deplete with use, unlike fossil fuels. This made it an attractive option for generating electricity.

2. Energy independence: The oil crisis highlighted the vulnerability of countries that heavily relied on oil imports. Developing wind power offered the opportunity to reduce dependence on foreign oil and increase energy independence.

3. Environmental concerns: Although concerns over global warming were not as prevalent in the 1970s as they are today, there was a growing awareness of the environmental impacts of burning fossil fuels. Wind power was seen as a cleaner alternative that could help reduce air pollution and mitigate the environmental damage caused by fossil fuel consumption.

4. Technological advancements: The 1970s also witnessed significant improvements in wind turbine technology. The development of more efficient and cost-effective wind turbines made it economically feasible to harness wind power on a larger scale.

Overall, the combination of the oil crisis, environmental concerns, and technological advancements in wind turbine technology created a favorable environment for the development of wind power in the 1970s. This led to increased research, investments, and government support for wind energy projects, setting the stage for the expansion of wind power in subsequent decades.

Non-conventional energy sources are those energy sources which are comparatively new technologies. Most of these sources are renewable and do not poses a threat to the environment. With increasing population and changing way of life, the energy requirement is growing at a fast pace. Thus non-conventional energy sources give the world an alternate birth to provide energy crunch and are also environment friendly, reducing the threat.

India and China are the two countries known to have large iron ore deposits in Asia.

Heading: Iron ore deposits in India
- India is one of the leading producers and exporters of iron ore in the world.
- The major iron ore deposits in India are found in the states of Odisha, Jharkhand, Chhattisgarh, Karnataka, and Goa.
- Odisha has the largest iron ore reserves in India, accounting for about one-third of the total reserves.
- The iron ore from these deposits is of high quality and is used for both domestic consumption and export.

Heading: Iron ore deposits in China
- China is the world's largest consumer and producer of iron ore.
- The major iron ore deposits in China are found in the provinces of Liaoning, Hebei, Shanxi, Inner Mongolia, and Henan.
- The country has both hematite and magnetite iron ore deposits, with the former being more abundant.
- China's iron ore deposits are mainly located in the northeastern part of the country, close to the coast, which facilitates easy transportation and export.

Heading: Comparison between India and China
- Both India and China have significant iron ore deposits, making them important players in the global iron ore market.
- However, there are some differences between the two countries in terms of iron ore production and consumption.
- China is the largest producer of iron ore in the world, accounting for about 45% of the global production. India, on the other hand, is the second-largest producer, with a share of around 8%.
- In terms of consumption, China is also the largest consumer of iron ore, driven by its steel industry's high demand. India, although a significant consumer, consumes less iron ore compared to China.
- Both countries also export a considerable amount of iron ore. China exports a significant portion of its production to other countries, while India primarily exports lower-grade iron ore to China.
- The iron ore deposits in both countries have contributed to their economic growth and development, supporting various industries, especially the steel industry.

In conclusion, India and China have large iron ore deposits in Asia, with significant contributions to global production and consumption. These deposits play a crucial role in supporting the steel industries of both countries and contribute to their economic development.

Mining is the process of extracting valuable minerals or other geological materials from the earth's surface or beneath the surface. It is a crucial and extensive industry that plays a significant role in the economy of many countries. The process involves various techniques and methods to extract minerals from rocks buried under the surface of the earth.

The Process of Mining:

1. Exploration: The first step in mining is exploration, where geologists and mining companies search for potential mineral deposits. This involves studying geological maps, conducting surveys, and collecting samples to determine the presence and quality of minerals in a specific area.

2. Site Preparation: Once a potential deposit is identified, the site is prepared for mining operations. This may involve clearing vegetation, building access roads, and establishing infrastructure like power supply, water sources, and accommodation for workers.

3. Extraction: The extraction process begins with the creation of mine shafts or tunnels to access the underground deposits. There are different methods of extraction depending on the type of mineral and the geological conditions. Some common methods include:

- Open-pit Mining: This method is used when the mineral deposit is close to the surface. It involves digging a large open pit or quarry and removing the overlying soil or rock to expose the mineral deposit.

- Underground Mining: This method is used when the mineral deposit is deep underground. It involves creating tunnels or shafts to access the deposit. Underground mining can be further categorized into various methods such as room and pillar mining, longwall mining, and block caving.

4. Processing: Once the minerals are extracted from the rocks, they need to be processed to remove impurities and obtain the desired mineral concentrate. This may involve crushing, grinding, washing, and separating the minerals through various physical and chemical processes.

5. Transportation: After processing, the mineral concentrate is transported to smelters, refineries, or other processing facilities for further purification and conversion into a usable form. This is often done through trucks, trains, ships, or pipelines depending on the distance and logistics involved.

6. Reclamation: Mining operations have a significant impact on the environment, and reclamation is an essential part of the mining process. Once the minerals are extracted, the area is rehabilitated by restoring vegetation, filling in open pits, and establishing measures to prevent erosion and contamination.

Conclusion: Mining is a complex process involving exploration, site preparation, extraction, processing, transportation, and reclamation. It requires careful planning, adherence to environmental regulations, and implementation of safety measures to ensure sustainable and responsible mining practices. The minerals obtained through mining are essential for various industries and contribute to economic development.

Scientific expeditions have found valuable minerals in some of these Antarctic areas, including antimony, chromium, copper, gold, lead, molybdenum, tin, uranium, and zinc—none approach a grade or size warranting economic interest. Also, noneconomic are the enormous deposits of coal and sedimentary iron.

CSIR-NML is situated in Jamshedpur. The Steel City of India. Jamshedpur is well connected to Rail. Road and Air (via Ranchi/Kolkata).

In terms of production as per last survey China's production stood at 1851000 tonnes in lead, 52000 tonnes of Tungsten, and 129831 tonnes of Antimony

Kolar Gold Fields: The Deepest Gold Mine in the World

The Kolar Gold Fields (KGF) located in the state of Karnataka, India, is considered one of the deepest gold mines in the world. Let's explore this fascinating mine in detail.

1. Introduction to Kolar Gold Fields:
- Located in the Kolar district of Karnataka, KGF was once a thriving mining town during the British Raj.
- The gold mining activity in KGF dates back to the ancient times, with historical records indicating gold extraction as early as the 2nd and 3rd century AD.
- However, it was during the British era in the 19th century that KGF witnessed significant development and became one of the major gold mining centers in the world.

2. Depth of the Mines:
- The mines at KGF are known for their incredible depth, with some shafts reaching depths of over 3 kilometers (nearly 2 miles) below the surface.
- The deepest point in the KGF mines is the Mysore Mine, which reached an astounding depth of 3,232 meters (10,604 feet).

3. Mining Techniques at KGF:
- The extraction of gold at KGF involved various mining techniques, including underground and open-pit mining.
- Underground mining involved digging shafts vertically down into the earth to access the gold-bearing ore. The miners then used various tools and machinery to extract the ore and separate the gold from other impurities.
- Open-pit mining, on the other hand, involved the excavation of the earth's surface to access the gold deposits. This technique was employed in areas where the gold was closer to the surface.

4. Historical Significance:
- KGF played a crucial role in the economic development of India during the British era. The gold extracted from these mines contributed significantly to the country's gold reserves.
- The mines also provided employment opportunities to thousands of people, attracting workers from different parts of India.

5. Decline of KGF:
- Despite its historical significance, the KGF mines experienced a decline in the 20th century due to various factors, including the depletion of high-grade gold deposits and the rising costs of extraction.
- The mines eventually ceased operations in 2001, marking the end of an era in gold mining.

In conclusion, the Kolar Gold Fields in Karnataka, India, is renowned for being one of the deepest gold mines in the world. With its rich history and remarkable depths, KGF holds a significant place in the global mining industry.

The biggest country in Europe produced more than 96 million tonnes of usable iron ore in 2018, out of which the iron content was estimated to be 56.7 million tonnes. Production increased the following year to 99 million tonnes, with the corresponding iron content touching 59 million tonnes.

Mining is called a robber industry because valuable resources are taken from the earth, hence depriving its resources. These resources are not formed in a small-time instead take millions of years to replenish. This is because it uses up the earth’s resources, therefore in a very poetic sense 'robbing' the earth of its natural resources that will not be laid down again, at least not for a too long period.

1970s energy crisis led to establishing the Commission for Additional Sources of Energy (CASE) in the Department of Science & Technology (India) in March 1981.

Explanation:

Definition of Conventional Energy Resources:
Conventional energy resources refer to the energy sources that have been traditionally used for a long time to meet the energy needs of society. These resources have been used for centuries and are well-established in the energy sector.

Examples of Conventional Energy Resources:
- Fossil Fuels: This includes coal, oil, and natural gas that have been the primary sources of energy for many decades.
- Nuclear Energy: Another conventional energy resource is nuclear power, which has been used for electricity generation for a significant period.
- Hydropower: Hydropower is also considered a conventional energy resource as it has been harnessed for electricity generation through dams and reservoirs.

Characteristics of Conventional Energy Resources:
- Reliability: Conventional energy resources are known for their reliability and consistent supply.
- Infrastructure: The infrastructure for utilizing conventional energy resources is well-established and widespread.
- Environmental Impact: Conventional energy resources often have a significant impact on the environment, such as air and water pollution.

Challenges of Conventional Energy Resources:
- Depletion: Fossil fuels are finite resources and are being depleted at a rapid rate.
- Environmental Concerns: Conventional energy resources contribute to climate change and other environmental issues.
- Cost: The cost of extracting, processing, and utilizing conventional energy resources can be high.
In conclusion, conventional energy resources have been the backbone of the global energy system for many years. However, with the growing concerns about climate change and environmental degradation, there is a need to transition towards cleaner and more sustainable energy sources.

Quarrying can become a significant environmental concern because it may destroy the humus of soil required for plants’ growth. It produces a lot of noise pollution due to explosives’ use to break the enormous chunks of rocks.

Wind energy: It is the energy possessed by moving air. It is a form of solar energy.

The state government has approved Rs 25 crore for setting up the 50 MW plant at the Gulf of Kutch. It will produce energy from the ocean tides. According to the estimates of the Indian government, the country has a potential of 8,000 MW of tidal power.

Geothermal energy refers to the heat and electricity produced using the heat from the Earth’s interior. Geothermal energy exists because the Earth grows progressively hotter with increasing depth.

It is an essential primary activity. It supports the industrial growth of a country.

The sovereign state of Venezuela in South America has long been associated with oil discovered there in the early 20th century. The country quickly became one of the world's leading exporters of oil.

Asia produces more than half of the world's tin. China, Malaysia and Indonesia are among the leading producers of tin in the world.

Lignocellulosic biomass (LB) is an abundant and renewable resource from plants mainly composed of polysaccharides (cellulose and hemicelluloses) and an aromatic polymer (lignin).

A pressure gradient is the rate of change (slope) of atmospheric (barometric) pressure concerning the horizontal distance at a given point in time. The pressure gradient is a force (P) that acts in a higher direction toward lower pressure.

Khetri Nagar is a town in Jhunjhunu district of Rajasthan in India. It is part of the Shekhawati region. Khetri is two towns, "Khetri Town" founded by Raja Khet Singhji Nirwan and "Khetri Nagar" which is about 10 km away from Khetri. Khetri Nagar, well known for its Copper Project, was built under Hindustan Copper Limited’s control, a public sector undertaking under the Government of India. Khetri Nagar is also very well known with the name of 'Copper'.

The increasing use of fossil fuels leads to its shortage and increased environmental damage, therefore, there is a pressing need to use renewable energy sources like solar energy, wind, tide, biomass, and life from waste material. These are called non-conventional energy sources. India has a vast potential of non-conventional energy sources which is around 95,000 MW.