Why do the poles experience about six months day and six months night?

3

(a)

What would have happened if the Earth did not rotate?

3

(a)

Explain the importance of leap year.

3

(a)

Why does the whole Earth not get day at the same time?

3

(a)

When does the Northern hemisphere have summer and why?

3

(a)

Compare between axis and orbit.

3

(a)

Define and discuss the significance of rotation and revolution of the Earth.

3

(a)

Why does the circle of illumination not coincide with the axis of the Earth?

3

(a)

Which are the important dates that receive direct sun rays on different parts of the Earth?

3

(a)

Differentiate between rotation and revolution of the Earth.

3

(a)

Write any two effects of the Earth's rotation.

3

(a)

Define the following terms: Dusk and Dawn.

3

(a)

Why does only one half of the Earth get light at one time?

3

(a)

Why is it hotter when the sunrays fall vertically at a place?

3

(a)

What do you understand by the term 'Autumn Equinox'?

3

(a)