NCERT Solutions for Class 6 Social Science Geography Chapter 3 Motions of the Earth contains answers to all the questions given in the exercise of the geography book. These solutions have been created on the basis of NCERT Book Guidelines. The solutions are prepared in simple language by our subject experts to help students in their exam preparation.
Class 6 Geography Chapter 3 Motions of the Earth Questions and Answers
Question 1: Answer the following questions briefly.
(a) What is the angle of inclination of the earth’s axis with its orbital plane?
(b) Define 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 66½°
(b) Rotation: The movement of the earth on its axis is known as Rotation.
Revolution: The movement of the earth around the sun in a fixed path or orbit is called Revolution.
(c) The year having 366 days is called a leap year.
(d)
| 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. |
| A larger portion of the Northern Hemisphere gets light from the Sun; hence, it is summer in the Northern Hemisphere. | 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, days are longer than nights. | During this period in the Northern Hemisphere, nights are longer than days. |
(e) When the whole earth experiences equal days and nights, it is called the equinox. There are two such days i.e. 21st March and 23rd September.
(f) The Earth is spherical in shape and is keeps on revolving and it is divided into two hemispheres. When Southern hemisphere gets in front of the sun, the portion facing the sun experiences summer while the other half away from the sun experiences winter and vice versa.
(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.
Question 2: Tick the correct answer.
(a) The movement of the earth around the sun is known as
(i) Rotation
(ii) Revolution
(iii) Inclination
Answer: (ii) Revolution
(b) Direct rays of the sun fall on the equator on
(i) 21 March
(ii) 21 June
(iii) 22 December
Answer: (i) 21 March
(c) Christmas is celebrated in summer in
(i) Japan
(ii) India
(iii) Australia
Answer: (iii) Australia
(d) Cycle of the seasons is caused due to
(i) Rotation
(ii) Revolution
(iii) Gravitation
Answer: (ii) Revolution
Question 3: Fill in the blanks.
(a) A leap year has _____ number of days.
(b) The daily motion of the earth is ____
(c) The earth travels around the sun in ____ orbit.
(d) The sun’s rays fall vertically on the Tropic of ____ on 21 st 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 rotation.
(c) The earth travels around the sun in elliptical orbit.
(d) The sun’s rays fall vertically on the Tropic of Cancer on 21st June.
(e) Days are shorter during winter season.