Why is air less dense than Earths rocks? A : The molecules in rock are larger than the molecules in air.
B: The molecules in rock are smaller than the molecules in air.
C : The molecules in air are further apart than in rocks.
D : The molecules in air are closer together than in rocks. ( this is science by the way )

There are two reasons: at higher altitudes, there is less air pushing down from above, and gravity is weaker farther from Earth's center. So at higher altitudes, air molecules can spread out more, and air density decreases

Explanation:

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

the answer is 0.42 is that is an option. this question provides no info