NCERT Solutions for Class 6 Social Science Geography Chapter 1 : The Earth in the Solar System

Q:

Fill in the blanks

(a) A group of ________ forming various patterns is called a ________.
(b) A huge system of stars is called________.
(c) ________is the closest celestial body to our earth.
(d) ________is the third nearest planet to the sun.
(e) Planets do not have their own________ and ___________.

A:

(a) A group of stars forming various patterns is called a constellation.
(b) A huge system of stars is called galaxy.
(c) The Moon is the closest celestial body to our earth.
(d) The Earth is the third nearest planet to the sun.
(e) Planets do not have their own heat and light.

Q:

Tick the correct answer

(a)The planet known as the “ Earth’s Twin is
(i) Jupiter (ii) Saturn (iii) Venus

(b) Which is the third nearest planet to the sun ?
(i) Venus (ii) Earth (iii) Mercury

(c) All the planets move around the sun in a
(i) Circular path (ii) Rectangular path (iii) Elongated path

(d) The Pole Star indicates the direction to the
(i) South (ii) North (iii) East

(e) Asteroids are found between the orbits of
(i) Saturn and Jupiter (ii) Mars and Jupiter (iii) The Earth and Mars

A:

(a)  (iii) Venus  ✓
(b)  (ii) Earth   ✓
(c)  (iii) Elongated path   ✓
(d)  (ii) North  ✓
(e)  (ii) Mars and Jupiter  ✓

Q:

Answer the following questions briefly

(a) How does a planet differ from a star?
(b) What is meant by the ‘Solar System’?
(c) Name all the planets according to their distance from the sun.
(d) Why is the Earth called a unique planet?
(e) Why do we see only one side of the moon always?
(f) What is the Universe ?

A:

(a)The planets are different from the stars in following ways:

Stars

Planets

Stars have their own heat and light.

Planets do not have their own heat and light.

They are made up of hot gases.

They are made up of gasses and rocks.

They twinkle at night.

Planet glow without flickering.

There are millions of stars in the Milky Way galaxy.

There are only 8 planets in the solar system.

(b)The Sun, eight planets, satellites and other celestial bodies like asteroid, meteoroids and comets forms the Solar System. They all move independently around the Sun in a definite path.

(c)The eight planets of our solar system according to their distance from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

(d) The Earth is called a unique planet because:

  1. It is the only planet, which supports life.
  2. It has optimum temperature. It is neither too hot nor too cold.
  3. Presence of air, which consists of life supporting gasses like Oxygen, Nitrogen, etc.
  4. Presence of water and soil, which support life on the Earth​​​

(e)  We only see the one side of the moon because the Moon rotates about its spin axis at the same rate that the Moon orbits the Earth, i.e., approximately 27 earth days.

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