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# NCERT Solutions for Class 6th Geography Chapter 3 : Motions Of The Earth

CBSE NCERT Solutions for Class 6th Geography Chapter 3 : Motions Of The Earth . NCERT Class 6 Geography Social Science Solutions. NCERT Class 6 Geography Social Studies Sst Textbook The Earth: Our Habitat Chapter 3 Solutions

Exercises

Page No: 21

1. Answer the following questions briefly.

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

The angle of inclination of the earth’s axis with its orbital plane is 66 ½º.

(b) Define rotation and revolution.
(d) Differentiate between the Summer and Winter Solstice.

 Summer Solstice Winter Solstice It is the position of the Earth when the rays of the sun fall directly on the tropic of cancer. It is the position of the Earth when the rays of the sun fall directly on the tropic of Capricorn. In this position, the North pole is tilted towards the sun. In this position, the North pole is tilted away from the sun. Due to large portion of the Northern hemisphere gets light from sun, it is summer in Northern Hemisphere. Due to large portion of the Southern hemisphere gets light from sun, it is winter in Northern Hemisphere. During this period in Northern hemispehre, days are longer than nights During this period in Northern hemisphere, nights are longer than days

(e) What is an equinox?

Equinox is the position of the earth when direct rays of the sun fall on the equator. At this position, neither of the poles is tilted towards the sun so, the whole earth experiences equal days and equal nights.

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

The Southern Hemisphere experience Winter and Summer Solstice in different times than that of the Northern Hemisphere because:
• When the North Pole is tilted towards the Sun, the Northern Hemisphere experiences Summer Solstice. At this time, since the South Pole is tilted away from the Sun, the Southern Hemisphere experiences Winter Solstice.
• When the North Pole is tilted away from the Sun, the Northern Hemisphere experiences Winter Solstice. At this time, since the South Pole is tilted towards the Sun, the Southern Hemisphere experiences Summer Solstice.

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

The Poles experience about six months of day and six months of night because of the tilt of the Earth on its axis. When the Northern hemisphere is tilted towards the Sun, the North Pole is inclined towards the sun, it experiences continuous daylight for six months. These conditions are reversed when the South hemisphere is tilted towards the Sun.

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

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

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

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

3. Fill in the blanks.

(a) A leap year has _______________ number of days.
► 366

(b) The daily motion of the earth is _______________.
► rotational

(c) The earth travels around the sun in ______________ orbit.
► elliptical

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

(e) Days are shorter during ___________ season.
► winter