Answer correctly.

1. The most common mineral that makes up rocks is ____________.
   1. silica
   2. limestone
   3. iron
   4. natural gas
2. The peeling of the outer layers of rocks in concentric layers is called ____________.
   1. exfoliation
   2. granular disintegration
   3. block disintegration
   4. columnar disintegration
3. Frost action is noted on the ____________.
   1. mountains
   2. plains
   3. deserts
   4. coastal plains
4. Intrusive igneous rocks have large grains as they take a long time to ____________ beneath the Earth.
5. Weathering leads to the breaking down of rocks and their transportation from one place to another. (True/False)
6. In desert regions, the daily range of temperature is high. (True/False)

Answer correctly.

1. Rusting of iron is caused due to ________________.
   1. carbonation
   2. oxidation
   3. hydration
   4. solution
2. Roots of plants and trees cause ________________ in the rocks.
3. The process of carbonation produces features like ________________ and ________________.
4. Water plays an important role in ________________ ________________.
5. Mudflow is the movement of water-saturated debris on a flat surface. (True/False)
6. Human beings break rocks for mining. (True/False)

Answer correctly.

1. Shelter belts are planted to check soil erosion in ______________.
   1. hilly areas
   2. areas with heavy rainfall
   3. forested area
   4. dry area
2. Construction of ______________ along the fields reduces soil erosion during floods.
3. Contour ploughing checks the flow of water in the fields. (True/False)
4. Afforestation is a method that speeds up soil erosion. (True/False)
5. Crop rotation replenishes the soil fertility. (True/False)

Picture Study

Observe the picture and answer the questions.

1. Identify the type of farming shown in the picture.
2. Where in India is this type of farming practised?
3. How is it done?
4. Why is it considered to be useful?

How are igneous rocks formed? Give two examples.