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Class 7 Geography Chapter 3 Question Answers - Our Changing Earth

Short Q & A :

Q1: What do you mean by lithospheric plates?

Ans :  The solid crust of the rocks forming the surface of the earth is known as Lithosphere .The lithosphere is broken into a number of plates. These plates are known as lithospheric plates.

Q2: Name the two types of tectonic movement.

Ans : Vertical earth movement and horizontal earth movement are the two kinds of tectonic movement.

Q3: What are volcanoes?

Ans : A volcano is an opening in the earth’s crust which allows hot molten rock, ash and gases to escape from below the surface.

Q4: Where are the volcanoes found?

Ans : Volcanoes are generally found where tectonic plates are pulled apart or come together. Volcanoes can also form where there is stretching and thinning of earth’s crust, such as in the (African) rift valley.

Q5: What is an earth quake?

Ans : When the lithosphere plates moves, the surface of the earth vibrates. The vibration can travel all around the earth. These vibrations are called earth quake.

Q6: Define weathering.

Ans : Weathering is the process by which a bed rock may creemble or decay, because of the action of atmospheric moisture, rain, frost, temperature changes, chemical action or underlying water and other associated features.

Q7: How a water fall formed?

Ans : The running water in the river erodes the landscape. When the river tumbles at steep angle over very hard rocks or down a steep valley side it forms a waterfall.

Q8: What are meanders?

Ans : As the river enter the plains it twists and turns forming large bends known as meanders. Due to continuous erosion and deposition along the side of the meander, the ends of the meander loop come closer and closer.

Q9: What do you mean by mushroom rocks?

Ans : An active agent of erosion and deposition in the deserts is wind. In desert we can see rocks in the shape of mushroom, commonly called mushroom rocks. The wind erodes the lower section of the rock more than the upper part.

Q10: Define Loess.

Ans : When the grains of sand are very fine and light, the wind can carry it over very long distance. When such sand is deposited in large areas, it is termed as loess.

Q11: What is a delta?

Ans : The river becomes so slow that it begins to deposit its load. Each distributary forms its own mouth. The collection of sediments from all the mouth forms a delta.

Q12: How are beaches formed?

Ans : The erosion and deposition of the sea waves gives rise to coastal landforms. The sea wave deposit sediments along the shores forming beaches.

 

Long Q&A:

Q1: How man is also responsible for earth quake?

Ans : Officially, there is such an area of research devoted to man made earth quake. Geologist and seismologist agree that humans can induce earthquake in five major ways of fluid injection into the earth, fluid extraction from the earthmining, nuclear testing and through the construction of dams and reservoirs. In fact, there are officially recorded instances of earth quake caused by human activity.

The document Class 7 Geography Chapter 3 Question Answers - Our Changing Earth is a part of the Class 7 Course Social Studies (SST) Class 7.
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FAQs on Class 7 Geography Chapter 3 Question Answers - Our Changing Earth

1. What are some causes of Earth's changing climate?
Ans. Some causes of Earth's changing climate include the increase in greenhouse gases such as carbon dioxide and methane, deforestation, industrial emissions, and the burning of fossil fuels. These activities contribute to the greenhouse effect, trapping heat in the atmosphere and leading to global warming.
2. How does climate change affect the Earth's ecosystems?
Ans. Climate change can have significant impacts on Earth's ecosystems. Rising temperatures can disrupt the natural habitats of various plant and animal species, leading to the loss of biodiversity. It can also result in changes in precipitation patterns, affecting water availability and increasing the risk of droughts or floods. These changes can have cascading effects on food webs and the overall functioning of ecosystems.
3. What are the consequences of melting polar ice caps?
Ans. The melting of polar ice caps, such as those in the Arctic and Antarctica, has several consequences. Firstly, it contributes to the rise in sea levels, leading to coastal erosion and increased flooding in low-lying areas. Secondly, it disrupts marine ecosystems, as species dependent on ice for breeding or hunting struggle to adapt. Lastly, the melting of ice caps releases stored greenhouse gases, further exacerbating climate change.
4. How does deforestation contribute to climate change?
Ans. Deforestation plays a significant role in climate change. Trees absorb carbon dioxide from the atmosphere and store it, acting as natural carbon sinks. When forests are cleared for agriculture, logging, or urbanization, the stored carbon is released back into the atmosphere as carbon dioxide, contributing to the greenhouse effect. Additionally, deforestation reduces the number of trees available to absorb carbon dioxide, further intensifying climate change.
5. What are some ways individuals can help mitigate climate change?
Ans. Individuals can contribute to mitigating climate change in several ways. They can reduce their carbon footprint by using energy-efficient appliances, conserving water, and opting for sustainable transportation methods such as walking, biking, or using public transport. Additionally, individuals can support renewable energy sources, practice recycling and waste reduction, and advocate for policies that promote sustainability. Small lifestyle changes can collectively make a significant impact in combating climate change.
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