# Motions of the Earth Class 6 Geography Chapter 3 Question Answer NCERT Solution

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NCERT Solution for Class 6 Geography Chapter 3 Motions of the Earth Textual Question Answer

## Motions of the Earth Class 6 Geography Chapter 3 Question Answer

1. Answer the following questions briefly.

(a) What is the angle of inclination of the earth’s axis with its orbital plane?

Ans. The axis of the earth which is an imaginary line makes an angle of 66½° with its orbital plane. Earth is tilted at an angle of 23½° from the vertical.

(b) Define rotation and revolution?

Ans.

• Rotation :- It is the movement of the earth on its axis. Earth takes 24 hours to complete one rotation.
• Revolution :- The movement of earth around the sun in a fixed path or orbit is called Revolution. Earth takes 365 days 6 hours to complete one revolution. Earth revolves from west to east.

(c) What is a leap year?

Ans. Earth takes 365 days and 6 hours to revolve around the sun. These 6 hours in four years create one extra day in a year and this year is called leap year with 366 days (29 days in February instead of 28 days). Leap year comes once in an interval of 4 years.

(d) Differentiate between the Summer and Winter Solstice.

Ans.

 Summer Solstice Winter Solstice 1. The earth is in this position on its orbit on 21st June. Winter Solstice is observed on 22nd December. 2. On this day the Northern Hemisphere is tilted towards the Sun i.e. Sun rays falls directly in the Tropic of Cancer(23½° N) . On this day the Tropic of Capricorn(23½° S) receives direct rays of the sun as the South pole tilts towards it. 3. The longest day and shortest day on the Northern Hemisphere is observed on 21st June while shortest day and longest night is observed in the Southern Hemisphere. It is summer in Southern Hemisphere with longest day and smallest night. The reverse happens in the Northern Hemisphere

(e) What is an equinox?

Ans. It is the position of the earth on 21st March and 23rd September along its orbit. On these days sun rays falls directly in the equator. At this position, neither of the poles is tilted towards the sun. On these dates the whole earth experiences equal days and equal nights. 23rd September (autumn season in Northern and spring season in Southern Hemisphere) while on 21st March ( autumn season in Southern and spring season in Northern Hemispheres) .

(f) Why does the Southern Hemisphere experience Winter and Summer Solstice in different times than that of the Northern Hemisphere?

Ans. When the Northern Hemisphere is inclined towards sun (on 21st June), the Southern Hemisphere is tilted away from the Sun, and gets shorter rays. Therefore when it is Summer in Northern Hemisphere, it is winter in Southern Hemisphere. The position is opposite on 22nd December (winter solstice).

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

Ans. Due to inclination of axis, the sun remains above the horizon from 21st March to 23rd September. At this situation North pole gets continuous light from the sun. Therefore there are continuous days for six months in this period. But south pole has a night for six months. For next six months, conditions are reversed. North pole has night for six months, while south pole has days for these six months.

(a) The movement of the earth around the sun is known as
(i) Rotation
(ii) Revolution
(iii) Inclination
Ans. (ii) Revolution

(b) Direct rays of the sun fall on the equator on
(i) 21 March
(ii) 21 June
(iii) 22 December
Ans. (i) 21 March

(c) Christmas is celebrated in summer in
(i) Japan
(ii) India
(iii) Australia
Ans. (iii) Australia

(d) Cycle of the seasons is caused due to
(i) Rotation
(ii) Revolution
(iii) Gravitation
Ans. (ii) Revolution

3. Fill in the blanks.
(a) A leap year has __________ number of days.
Ans. 366

(b) The daily motion of the earth is ___________.
Ans. Rotation.

(c) The earth travels around the sun in __________ orbit.
Ans. elliptical

(d) The sun’s rays fall vertically on the Tropic of ________ on 21st June.
Ans. Cancer

(e) Days are shorter during _______ season.
Ans. Winter

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