Question

. Why do the terrestrial planets lack hydrogen and helium in their atmospheres?

A. Hydrogen and helium were converted to other compounds as the planets formed.
B. Hydrogen and helium were blown away by solar wind.
C. Hydrogen and helium can't be retained because the planet masses are too small.
D. Hydrogen and helium are present in rings around the terrestrial planets.

Answer 1

D will be the ans acc to me

Answer 2

Answer:(B). Hydrogen and Helium were blown away by solar winds.

Explanation:

At present there're 4 terrestrial planets in our solar system. These are Mercury, Mars, Venus, and Earth. These planets are closer to the sun and due to rise in temperature, hydrogen and helium became energetic and they were easy to escape.

These planets are smaller than other planets in solar system. And they didn't have enough gravity to hold these energetic light gases.