Available Answers

1. 1.

   Give one or two words for the following.

   1. The ability to do work ____________
   2. Energy from the sun ____________
   3. Star patterns in the sky ____________
   4. Largest planet in our solar system ____________
   5. The earth's outermost layer ____________
   6. Main cause of weather change ____________
   7. Clouds are formed by this ____________
   8. Frozen raindrops ____________
   9. Agriculture and industrial wastes pollute ____________
   10. A non-polluting fuel for vehicle ____________
2. 2.

   Fill in the blanks.

   1. ______________ is energy from the interior of the earth.
   2. Our earth is one of the eight planets that move around the ______________.
   3. About 71 per cent of earth's surface is covered with ______________.
   4. When the water vapour in the air condenses and appears as droplets on the ground it is called ______________.
   5. Plastic, rubber, glass, etc. cannot be decomposed and are called ______________ waste.
3. 3.

   What is the source of atomic energy? How should it be used?

4. 4.

   Why is the season in the Northern Hemisphere always different from the season in the Southern hemisphere?

5. 5.

   How is a volcano formed on earth?

6. 6.

   What are the effects of evaporation and condensation of water in nature?