What are two questions a geochemist might try to answer?

what properties make up different kinds of rocks, is there oil under the gulf of mexico? :P

They would probably try to answer "why do pesticides kill flowers"

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

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