Burninf fossil fuels contributes to the formation of Oa air pollution
Ob global warming
Oc acid precipitation
Od all of them

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

i'd say that the moon rock is about 2.2 billion years old.