E. Answer the following questions very briefly.
1. Why is environment important for us?
2. Define lithosphere.
3. Define biosphere.
4. List the major components of environment.
5. How is lithosphere important for us?
6. How does cutting of forests affect the environment?
7. How does burning of leaves affect people?
Answers
Answer:
1)Healthy ecosystems clean our water, purify our air, maintain our soil, regulate the climate, recycle nutrients and provide us with food. They provide raw materials and resources for medicines and other purposes. They are at the foundation of all civilisation and sustain our economies.
2)the rigid outer part of the earth, consisting of the crust and upper mantle.
3)the part of the earth’s surface and atmosphere in which plants and animals can live.
4)The basic components of the environment are atmosphere or the air, lithosphere or the rocks and soil, hydrosphere or the water, and the living component of the environment or the biosphere. the thick gaseous layer surrounding the earth.
5)The solid crust of the earth is known as lithosphere. It provides us with forests, grasslands fro grazing and valuable land for agriculture and human settlements. It is also an important source of mineral resources.
6)The loss of trees and other vegetation can cause climate change, desertification, soil erosion, fewer crops, flooding, increased greenhouse gases in the atmosphere, and a host of problems for indigenous people.
7)Burning of leaves leads to air pollution, health problems and fire hazards. Leaf smoke may also contain hazardous chemicals such as carbon monoxide, which can mix with haemoglobin in the bloodstream and reduce the amount of oxygen in the blood and lungs.
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