Question

Why are the terrestrial planets rocky?

Solution

The terrestrial planets are rocky because they are earth-like and are made up of rocks and metals and have relatively high densities.

Question

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What are the differences between inner planets and outer planets? Mention.

Solution

The difference between inner planets and outer planet are mentioned below:
Inner planets:
(i)The inner planets are Mercury, Venus, Earth and Mars.
(ii)They are lying between the sun and the belt of asteroids.
(iii)These are solids like earth.
(iv)These are known terrestrial planets.
(iv)They are relatively smaller and their lower gravity does not hold the escaping gases.
Outer planets:
(i)The outer planets are Jupiter, Saturn, Uranus, Neptune and Pluto.
(ii)They lie away from the asteroid belt.
(iii)These are gaseous planets as they are made up of gases.
(iv)They are called Jovian planets.
(v)They are relatively larger in size. Their higher gravity holds up the gases.

Question

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Explain the stages considered in the development of planets.

Solution

The following are considered to be the stages in the development of planets :

(i)The stars are the localised lumps of gas within a nebula. The gravitational force within the lumps leads to the formation of a core to the gas cloud and the huge rotating disc of gas and dust develops around the gas core.

(ii)In the next stage, the gas cloud starts getting condensed and the matter around the core develops into smallrounded objects. These small-rounded objects by the process of cohesion develop into what is called planetesimals. Larger bodies start forming by collision, and gravitational attraction causes the material to stick together. Planetesimals are a large number of smaller bodies.
(iii)In the final stage, these large number of small planetesimals accrete to form a fewer large bodies in the form of planets

Question

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What was the nature of the earth's surface initially ?

Solution

The nature of the earth's surface initially was a torrid, rocky and hot, having a thin atmosphere of hydrogen and helium.

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The Earth

Why are the terrestrial planets rocky?

What are the differences between inner planets and outer planets? Mention.

Explain the stages considered in the development of planets.

What was the nature of the earth's surface initially ?

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