II. Long-answer questions:
1. State any three differences between stars
and planets.
2. Give two evidences to prove that the Earth is spherical in shape. (Explain them).
3. Why the Pole Star is used for identifying the north direction?
4. With the help of neat diagrams explain the various stages of evolution of the Earth.
5. Why is it extremely urgent and essential to protect the Earth's environment?
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Answer:
1.Stars Planets
Stars are incredibly hot having high temperatures to them. Planets, on the other hand, have relatively low temperatures.
They are objects that produce their own light and do not rely on an external source for the production of light Planets are incapable of producing their own light.
Stars have a unique effect of twinkling in the sky. Planets do not exhibit the twinkling effect unlike stars
The stars change their position, but can be seen only after a long time due to substantial distance. Planets in orbits on their own axis change their positions constantly.
Stars consist of matters like Hydrogen, Helium
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