Available Answers

1. 1.

   Why does the Earth have optimum temperature conditions?
2. 2.

   Mention three unique features of the Earth.
3. 3.

   State how the atmosphere around the Earth is different from those around the other planets.

4. 4.

   State the significance of the atmosphere.
5. 5.

   What is meant by hydrosphere?
6. 6.

   State the importance of lithosphere.