Available Answers

1. 1.

   Tick the correct answer.

   1. Deforestation/Afforestation brings about soil erosion.
   2. Terrace farming is done on hill slopes/plains.
   3. Air contains 78 per cent oxygen/nitrogen gas.
   4. Humidity is high/low in places near the sea.
   5. Granite/limestone is an igneous rock.
   6. Igneous rocks/sedimentary rocks are formed by cooling of the lava.
   7. We can/cannot see air.
   8. Embankment/fences are built along the river sides.
   9. Helium/argon gas is filled in bulbs.
   10. Rocks are made up of minerals/gemstones.
2. 2.

   Define the term Air pollution.
3. 3.

   Define the term Soil erosion.
4. 4.

   Define the term Fossils.
5. 5.

   Define the term Deforestation.
6. 6.

   Define the term Atmosphere.