NCERT Solution for Geography Class 6 Chapter 3 Motions of Earth
The Earth has two types of motions, which lead to seasons and day-night patterns. These motions are - rotation aound its axis and revolution around the sun. Rotation means the movement of the earth on its axis. It rotates from the west towards the east. Revolution means the movement of earth around the sun in a fixed path or orbit. This movement causes seasonal variations in different parts of the Earth. Students can go through our NCERT Solutions of Class 6 Social Science Geography Chapter 3, which is neatly arranged for your convenience. The question provided in the NCERT Textbook are solved in an elaborate and step by step manner here.
1. Answer the following questions briefly.
(a) What is the angle of inclination of the earth's axis with its orbital plane ?
Answer:
The earth remains tilted to one side while it revolves around the earth at an angle of 66 and half degree.
(b) Define rotation and revolution.
Answer:
Rotation : The movement of the earth on its own axis is called rotation. The earth takes 24 hours to complete one rotation. It causes day and night.
Revolution : The movement of the earth around the sun in a fixed orbit is called revolution. The earth takes 365 days and 6 hours to complete one revolution. It causes seasons.
(c) What is a leap year ?
Answer:
It is a year when the month of February has 29 days instead of 28 days. Every fourth year is a leap year.
(d) Differentiate between Summer and Winter Solstice.
Answer:
Summer solstice : It is the position of the earth when the Northern Hemisphere has the longest day and the shortest night. It occurs on 21st June. In the Southern Hemisphere, it is winter season at this time. The days are short and the nights are long.
Winter solstice : It is the position of the earth when Southern Hemisphere has long days and shorter nights. In the Northern Hemisphere, the days are short and the nights are long. It occurs on 22nd December.
(e) What is an equinox ?
Answer:
Equinox are days when direct rays of the sun fall on the equator. At this position neither of the poles are titled towards the sun, so the whole earth experiences equal days and equal nights. It occurs on 21st March and 23rd September.
(f) Why does the Southern Hemisphere experiences Winter and Summer Solstice in different times than that of Northern Hemisphere.
Answer:
The seasons in Southern Hemisphere and Northern Hemisphere are exactly the opposite.
(g) Why do the poles experience six months day and six months night ?
Answer:
When the rays of the sun fall directly on the Tropic of Cancer (21st June), the areas near the South Pole receive less heat. The North Pole is inclined towards the sun and places beyond the Arctic circle experience continuous daylight. At this time, the Southern Hemisphere has the opposite season. The nights are long and areas beyond Antarctic circle remain in continuous night.
The reverse will happen on 22nd December.
2. Tick the correct answers.
(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) 21st March (ii) 21st June (iii) 22nd Decemer
Answer:
(i) 21st March
(c) Christmas is celebrated in summer in
(i) Japan (ii) India (iii) Australlia
Answer:
(iii) Australlia
(d) Cycle of the seasons is caused due to
(i) Rotation (ii) Revolution (iii) Gravitation
Answer:
(ii) Revolution
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 21st June.
(e) Days are shorter during............season
Answer:
(a) 366
(b) rotation
(c) elliptical
(d) Cancer
(e) Winter