2. Distinguish between internal and external forces. 3. How are mountains different from plateaus? 4. How are block mountains formed? How are they different from fold mountains? 5. How are mountains useful to humans? 6. Define a plateau. How are they useful human beings? 7. What are plains? How are they formed? Why do people prefer to live on plains? 8. Name some human activities that pollute water and degrade land. Suggest two measures to prevent pollution and degradation. to
Answers
2.External forces are forces caused by external agent outside of the system. Internal forces are forces exchanged by the objects in the system.
3.Mountains and plateaus are both landforms with elevated areas. The main difference between mountain and plateau is that mountain is an elevated, pointed structure whereas a plateau is an elevated area with a flat top.
4.Block Mountains are formed when two tectonic plates move away from each other causing cracks on the surface of the Earth. When parallel cracks or faults occur, the strip of land or the block of land between them may be raised resulting in the formation of block mountains. The upward block is called a horst.
5.Mountains are useful to man in various ways: Mountains are a storehouse of water. Water from the mountains is also used for irrigation and generation of hydro-electricity. The river valleys and terraces are ideal for the cultivation of crops.
6.. A plateau is an area of raised land that is flat on top. Plateaus are very useful becasue it is a storehouse of minerals that are used as raw materials for many industries.
7.Plains are fertile flat lands. Plains can be formed by eroded sand from rivers and other water bodies. People prefer to live on plains because there is a very high quality soil and are flatlands so it is easy to build a house there rather than plateaus.
8.Some human activities that pollute land are deforestation, mining and disposal of wastes. Some human activities that pollute water are disposal of chemical and sewages in water bodies, mindless use and disposal of plastic which accumulate in water bodies and washing of clothes in river water.
hope it's helpful
External forces are forces caused by external agent outside of the system
by faults in the crust, a seam where rocks can move past each other
formed when two tectonic plates move towards each other leading to the folding of the layers of the Earth
an area of fairly level high ground.