Available Answers

1. 1.

   Multiple choice questions:

   1. Soil is formed by the process of:
      1. fossilisation
      2. weathering of rocks
      3. rock cycle
      4. volcanic eruption
   2. Tides are caused due to the:
      1. gravity of moon 
      2. mass of moon
      3. atmosphere of moon
      4. craters of moon
   3. Igneous rocks are formed by the:
      1. deposition of layers cemented together
      2. cooling down of lava
      3. change in temperature and pressure in the earth's crust
      4. deposition of fossils and minerals
   4. Land pollution makes the soil:
      1. fertile
      2. infertile
      3. acidic
      4. basic
   5. The layer of atmosphere having electrically charged particles is called:
      1. troposphere
      2. stratosphere
      3. ionosphere
      4. exosphere
2. 2.

   Describe lunar eclipse.

3. 3.

   How is coal formed? What are the main uses of coal?

4. 4.

   Which rock is used to make blackboard and slates?

5. 5.

   What are the different methods used to purify water?

6. 6.

   What is soil erosion?