NCERT Solutions for Class 6 Social Science Geography Chapter 3 Motions of the Earth are part of NCERT Solutions for Class 6 Social Science. Here we have given NCERT Solutions for Class 6 Social Science Geography Chapter 3 Motions of the Earth.
|Subject||Social Science Geography|
|Chapter Name||Motions of the Earth|
|Number of Questions Solved||5|
NCERT Solutions for Class 6 Social Science Geography Chapter 3 Motions of the Earth
NCERT TEXTBOOK EXERCISE (Pages 21-22)
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?
(a) The angle of inclination of the Earth’s axis is 23°. The axis forms an angle of 66° with its orbital plane.
(b) (1) Rotation. The movement/motion of the earth on its axis in 24 hours is defined as rotation.
(2) Revolution. The movement/motion of the Earth around the Sun in its orbit in 365 days is called revolution.
(c) Leap Year. The year (every four years) with 366 days instead of 365 days is known as leap year.
(d) Difference between Summer and Winter Solstice
|Summer Solstice||Winter Solstice|
|1. Summer solstice occurs on 22nd June in 1 Northern hemisphere.||1. Winter solstice occurs on 22nd December in Northern hemisphere.|
|2. The whole Northern hemisphere experiences more heat and light.||2. Northern hemisphere experiences less heat and light.|
|3. It is summer in the Northern hemisphere.||3. It is winter in the Northern hemisphere.|
|4. Days are longer, nights are shorter.||4. Days are shorter, nights are longer.|
|5. Reverse conditions prevail in the Southern hemisphere.||5. Reverse conditions prevail in the Southern hemisphere.|
(e) Equinox is the position of the Earth on 21st March and 23rd September. Both the hemispheres experience equal days and nights.
- On 21st March in the Northern hemisphere this position is spring equinox. Autumn equinox is in the Southern hemisphere.
- In the Northern hemisphere on 23rd September the position of the Earth is Autumn equinox and in Southern hemisphere it is Spring equinox.
(f) The Southern hemisphere experiences winter and summer solstice in different times than, that of the Northern hemisphere because of the following reasons:
- Southern hemisphere is tilted towards the Sun on 22nd December, hence summer solstice is there in the Southern hemisphere. At that time winter solstice is in the Northern hemisphere when it is away from the Sun.
- On the contrary on 21 June the Northern hemisphere is tilted towards the Sun.
Hence summer solstice is in the Northern hemisphere and winter solstice is in the Southern hemisphere.
(g) The poles experience six months’ day and six months’ night because of the following reasons:
- When the Northern hemisphere is tilted towards the Sim, the North Pole remains in the light for the whole of the day (24 hours). This position remains for six months (from 21st March to 23rd September).
- On the contrary in the Southern hemisphere the South Pole does not get light during these six months. Hence it experiences night for six months (from 23rd September to 21st March).
- When the Southern hemisphere is tilted towards the sun, the South Pole remains in light for 24 hours for six months from 23rd September to 21st March. Reverse are the conditions at the North Pole-six months’ night.
Tick the correct answers.
(а) The movement of the earth around the sun is known as
(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
(d) Cycle of the seasons is caused due to
(a) → (ii) Revolution
(b) → (i) 21 March
(c) → (iii) Australia
(d) → (ii) Revolution
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 21st June.
(e) Days are shorter during …………. season.
What would happen if the Earth did not rotate?
If the earth did not rotate,
- The portion before the sun would have remained the same and continued to experience day regularly.
- On the other hand the portion of the Earth away from the sun would have experienced night continuously.
- Life would have not been possible on the Earth in such a situation.
Do you know in Australia Christmas is celebrated in the summer season?
Yes, we know that in Australia Christmas is celebrated in summer season, i.e., 25th December when there is summer in Australia (the Southern Hemisphere).
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