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From which layer of the earth minerals are extracted?
  • a)
    Crust
  • b)
    Mantle
  • c)
    Core
  • d)
    Barysphere
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
From which layer of the earth minerals are extracted?a)Crustb)Mantlec)...
The correct answer is option 'A': Crust.

Explanation:

The Earth is made up of several layers, including the crust, mantle, and core. Minerals are primarily extracted from the crust, which is the outermost layer of the Earth.

1. The Earth's Crust:
- The crust is the thin, solid outermost layer of the Earth.
- It is composed of a variety of rocks, minerals, and sediments.
- The crust is divided into two main types: continental crust and oceanic crust.
- Continental crust is thicker and less dense compared to oceanic crust, which is thinner and denser.

2. Mineral Extraction:
- Minerals are naturally occurring inorganic substances with a definite chemical composition and crystal structure.
- They are found in various forms in the Earth's crust and are extracted for various purposes, including industrial, economic, and scientific uses.
- Mining is the process of extracting minerals from the Earth's crust.
- Different methods, such as open-pit mining, underground mining, and placer mining, are used depending on the type and location of the mineral deposit.

3. Mineral Resources in the Crust:
- The Earth's crust contains a wide range of mineral resources, including metals (such as gold, copper, iron, and aluminum), gemstones (such as diamonds and rubies), industrial minerals (such as limestone, gypsum, and silica), and fossil fuels (such as coal, oil, and natural gas).
- These minerals are distributed unevenly across the Earth's crust and can be found in various geological formations, such as veins, ore bodies, and sedimentary deposits.

4. Importance of Mineral Extraction:
- Mineral extraction plays a crucial role in various industries and sectors of the economy.
- Metals are used in construction, manufacturing, electronics, transportation, and energy production.
- Industrial minerals are essential for building materials, chemicals, ceramics, and agriculture.
- Gemstones have both aesthetic and economic value.
- Fossil fuels are the primary source of energy for heat, electricity, and transportation.

In conclusion, minerals are primarily extracted from the Earth's crust, which is the outermost layer. The crust contains a wide range of mineral resources that are vital for various industries and sectors. Mining is the process used to extract these minerals from the Earth's crust.
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Direction: Read the case study given below and answer the questions that follow:Depending on the mode of occurrence and the nature of the ore, mining is of two types: surface and underground mining. The surface mining also known as open-cast mining is the easiest and the cheapest way of mining minerals that occur close to the surface. Overhead costs such as safety precautions and equipment are relatively low in this method. The output is both large and rapid. When the ore lies deep below the surface, underground mining method (shaft metho d) has to be used. In this method, vertical shafts have to be sunk, from where underground galleries radiate to reach the minerals. Minerals are extracted and transported to the surface through these passages. It requires specially designed lifts, drills, haulage vehicles, ventilation system for safety and efficient movement of people and material. This method is risky. Poisonous gases, fires, floods and caving in lead to fatal accidents. The developed economies are retreating from mining, processing and refining stages of production due to high labour costs, while the developing countries with large labour force and striving for higher standard of living are becoming more important. Several countries of Africa and few of south America and Asia have over fifty per cent of the earnings from minerals alone.Which type of mining uses the method of excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom?

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From which layer of the earth minerals are extracted?a)Crustb)Mantlec)Cored)BarysphereCorrect answer is option 'A'. Can you explain this answer?
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