The Earth


Earth And Solar System - Concepts
Class - 6th CBSE Subjects
 
 
Concept Explanation
 

The Earth

Earth: The Earth is the third nearest planet to the Sun. In size, it is fifth largest planet. It is slightly flattened at the poles. That is why, its shape is described as a Geoids. Geoids mean an earth like shape. From the outer space, the earth appears blue because its two-third surface is covered by water. It is also called a blue planet. Conditions favorable to support life are probably found only on the earth. The rotation of the Earth causes day and night, the revolution of the Earth causes the seasons. The favourable conditions that facilitate life on the Earth are:•    Optimum distance from the Sun.•    An average surface temperature of 40 °C.•    Suitable seasons and weather condition.•    Adequate availability of liquid water.•    The presence of an atmosphere that protects living things from harmful ultra-violet radiations from the Sun.

Stars

Planets

1.    They are self-luminous-they emit their own light and heat.

2.    They are very hot.

3.    They twinkle.

4.    They are very large.

5.    The Sun is an example of a star.

They are non-luminous –they only reflect the light of their star.

Surface temperature depends on distance from the star.

They do not twinkle they way stars do.

They are smaller than stars.

The Earth is an example of a planet.

 

Sample Questions
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Question : 1

When did Galileo discovered that the Earth revolves around the Sun?

Right Option : A
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Question : 2

Which one of the following conditions is most relevant for the presence of life on Mars?

Right Option : C
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Question : 3

Who discovered that the Earth revolves around the Sun?

Right Option : A
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