Why do Earth, Mars, and Venus lack any hydrogen and helium in their atmospheres?
They spin too quickly on their axes.
Their gravitational pull is too weak.
Their gravitational pull is too strong.
Their masses are too large.
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A large planet such as Jupiter has enough gravity to hold on to most of its hydrogen and helium, which is why these elements dominate the atmospheres of gas giants. But the gravity of Earth isn't strong enough, so Earth's early atmosphere of helium and free hydrogen evaporated into space.
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