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:

Hope this helps!

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.