The core of the earth is mostly composed of
a.
magnesium and silicon
b.
aluminum and silicon
c.
nickel and iron
d.
aluminum and iron

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.

it marks things for degradation via the proteasome. it alters there celluar location.