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The Origin and Evolution of the Earth — Geography STD 11 Humanities — Question

CBSE BoardEnglish MediumSTD 11 HumanitiesGeographyThe Origin and Evolution of the Earth3 Marks
Question
Answer the following question about 30 words:
Why are the terrestrial planets rocky?
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Answer

Mercury, Venus, Earth and Mars are called "rocky" or "terrestrial" planets. Terrestrial planets mean earth-like planets. These are similar to Earth in composition. Heat from the Sun evaporated lightweight elements like hydrogen and helium into interplanetary space. Mostly rock and metal was left in this zone and clumped together to form the inner rocky planets.

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