In earths surface or the bottom of the Ocean
Answer:
It is less dense. It is also less dense than the oceanic crust.
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Parasitism... basically a tick and a dog. The dog is the host, which is harmed by the tick.
a. 48.6 is magnesium and 32.0 is oxygen
b. 80.6
c. also 80.6
d. yes, because the product has equal mass to the reactants