A hot air ballon rises because? a. molecules become lighter when heated
b. molecules move faster and father apart when heated
c. molecules are less attracted by gravity when heated
d. molecules become charged and repel each other when heated ​

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium