Page 114 - SST Class 06

season in the Southern Hemisphere; and on 21 of the Earth are responsible for the phenomena of
March, this situation is reversed; that is, it is day-night and seasons.
autumn in the Southern Hemisphere and spring in
the Northern Hemisphere. Activity
Prepare a diagram showing the Earth’s revolution
Thus, you can see that the rotation and revolution
around the Sun and the occurrence of seasons.

v The motions of the Earth are responsible for the occurrence of day-night and seasons.
v The unequal length of days and nights is due to the tilt of the Earth.
v The Earth revolves round the Sun in an elongated path.
v The hemisphere which receives sunlight for a longer duration has summer and the one which receives
sunlight for a shorter duration has winter.
v The Sun shines over the Tropic of Cancer vertically on 21 June and it shines over the Tropic of Capricorn on
22 December.
v The days and nights are equal on 21 March and 23 September because the Sun shines vertically over the
Equator on these days.

A. Tick (3) the right option :

1. The spinning of the Earth on its axis is known as ____________ .
(a) rotation (b) revolution (c) spinning

2. The Earth rotates on its axis like a ____________ .
(a) windmill (b) top (c) wheel
3. The Earth tilts at an angle of ____________ .

(a) 23 ½° (b) 60 ½° (c) 23°
4. A leap year has ____________ days.
(a) 365 (b) 366 (c) 28

5. The days and nights are equal on ____________ .
(a) 21 March (b) 23 September (c) both
6. The Earth revolves round the ____________ in an elongated path.

(a) Sun (b) Moon (c) Star
7. When the Earth is nearest to the Sun, it is called ____________ .

(a) aphelion (b) perihelion (c) ellipse
8. The month of February has 28 days, but in a leap year, it has ____________ .
(a) 26 days (b) 27 days (c) 29 days

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