Which of the following are indirect sources to know interior of earth 1 Meteors 2 Gravitation 3 Seis...........

Geography Earth Geology

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Which of the following are indirect sources to know interior of earth?

1. Meteors

2. Gravitation

3. Seismic Waves

4. Volcanic eruptions

Select the correct answer using the codes given below.

1,2&3 only

2,3&4 only

1,3&4 only

All of the above

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Explanation:

Sources of Information about the interior of the earth are:
Direct Sources:Rocks from mining area,Volcanic eruptions
Indirect Sources:
By analyzing the rate of change of temperature and pressure from the surface towards the interior.Meteors, as they belong to the same type of materials earth is made of.Gravitation, which is greater near poles and less at the equator.Gravity anomaly, which is the change in gravity value according to the mass of material, gives us information about the materials in the earth’s interior.Seismic Waves: the shadow zones of body waves (Primary and secondary waves) give us information about the state of materials in the interior.