NCERT Solutions for Class 6 Social Science (Geography) Chapter 3 Motions of the Earth

NCERT
SOLUTIONS
CLASS - 6TH

aglase .co

Book : The Earth Our Habitat NCERT Solutions | Chapter - 3 Geography

Class : 6th
Subject : Geography
Chapter : 3
Chapter Name : Motions of the Earth

Q1 Answer the following questions brie�y.
(a) What is the angle of inclination of the Earth's axis with its orbital plane?
(b) De�ne rotation and revolution.
(c) What is a leap year?
(d) Differentiate between the Summer and Winter Solstice.
(e) What is an equinox?
(f) Why does the Southern Hemisphere experience Winter and Summer Solstice in
different times than that of the Northern Hemisphere?
(g) Why do the Poles experience about six months day and six months night?

Answer. (a) The angle of inclination of the Earth's axis with its orbital plane is 661/20.
(b) Rotation is the movement of the Earth on its axis. Revolution is the movement of the
Earth around the Sun in a �xed path or orbit.
(c) Earth takes 3651/4 days to revolve around the Sun. However, for the sake of
convenience, we consider a year as consisting of 365 days. The six hours (114th of 24
hours) that are ignored make one day (24 hours) over a span of four years. This surplus
day is added to the month of February. Thus, every fourth year, February has 29 days,
and such a year (with 366 days) is known as a leap year.
(d) Summer Solstice
It is the position of the Earth when the rays of the Sun fall directly on the Tropic of
Cancer.
In this position, the North Pole is tilted towards the Sun.
A larger portion of the Northern Hemisphere gets light from the Sun; hence, it is
summer in the Northern Hemisphere.
During this period in the Northern Hemisphere, days are longer than nights.

Winter Solstice
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 away from the Sun.
A larger portion of the Southern Hemisphere gets light from the Sun; hence, it is winter
in the Northern Hemisphere.
During this period in the Northern Hemisphere, nights are longer than days.

Page 1 of 3 Aglasem Schools

(e) Equinox is the position of the Earth when the rays of the Sun fall directly on the
Equator. At this position, neither of the Poles is tilted towards the Sun. As a result, the
entire Earth has equal days and equal nights.
(f) 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) The Poles experience about six months of day and six months of night because of the
tilt of the Earth on its axis. Because of this tilt, each Pole is tilted towards and away from
the Sun for about six months each. When the North Pole is tilted towards the Sun, it
experiences continuous daylight for six months. It is night for the same time period at
the South Pole. These conditions are reversed when the South Pole is tilted towards the
Sun.

Q2 Tick the correct answers:

(a) The movement of the Earth around the Sun is known as
(i) rotation (ii) Revolution (iii) Inclination

(b) Direct rays of the Sun fall on the Equator on
(i) 21 March (ii) 21 June (iii) 22 December

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

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

Answer. (a) The movement of the Earth around the Sun is known as Revolution
(b) Direct rays of the Sun fall on the Equator on 21 March
(c) Christmas is celebrated in summer in Australia
(d) Cycle of seasons is caused due to Revolution

Q3 Fill in the blanks.

Page 2 of 3 Aglasem Schools

(a) A leap year has _____________number of days.

(b) The daily motion of the Earth is__________

(c) The Earth travels around the Sun in _______

(d) The Sun's rays fall vertically on the Tropic of orbit________on 21st June.

(e) Days are shorter during_____season.

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

(b) The daily motion of the Earth is rotational.

(c) The Earth travels around the Sun in a �xed elliptical orbit.

(d) The Sun's rays fall vertically on the Tropic of Cancer on 21st June.

(e) Days are shorter during winter season.

Page 3 of 3 Aglasem Schools