Page 7 - sst_class_06

as Geoid which means an earth-like shape. It appears
blue in colour. This is because of presence of water on

two-thirds surface of the Earth. It is, therefore, called
a ‘Blue Planet’ which sustains all types of life.
Necessary conditions for existence of life on the Earth :

• It has moderate temperature. It is neither too hot nor too
cold because it has the right distance from the sun. The Earth
• It has right gravitational force.

• Availability of water and air makes life possible here.
• A blanket of ozone layer protects us from the harmful radiations of the sun.

4. The Mars : It is the fourth planet from the sun. It is also known as the red planet due
to its colour. Its size is almost half of the size of the Earth. It has two moons. It is
named by the Romans in honour of their God of war.

5. The Jupiter : It is the fifth planet from the sun. It has 50 confirmed moons and 14
provisional moons. It has colourful latitudinal bands of atmospheric clouds. It is named
after the ruler of the Roman gods.

6. The Saturn : It is the sixth planet from the sun. It is the second largest planet in the solar
system. It has 53 confirmed moons and 9 provisional moons. It has bright rings made of
icy particles around its equator. It is named after Jupiter’s father in Roman mythology.

Planets Distance from the Time for one Time for one Satellites
sun (in Million km) revolution rotation (Moons)

Mercury 57.6 88 days 58.6 days No

Venus 107.5 225 days 243 days No

Earth 149.8 365 ¼ days 23.93 hours 1

Mars 225.6 687 days 24.62 hours 2

Jupiter 772.8 11.11 years 9.93 hours 64

Saturn 1417.6 29.5 years 10.66 hours 62
Uranus 2852.8 84 years 17.24 hours 27

Neptune 4497.0 165 years 16.11 hours 13

7. The Uranus : It is the seventh planet from the sun. It has also rings around its equator.
It is the third largest planet in the solar system. It has 27 moons. It is named after the
Greek God of the sky.

8. The Neptune : It is the eighth planet from the sun. Its colour is blue due to methane
gas. It has 13 moons. It is almost similar in size to Uranus. It is named after the Roman
God of the sea.

Social Studies-6 7