What unit do they usually use to measure stars distance

astronomical unit, or A.U.

Explanation:

it is about 93 million miles or 150 million kilometers

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.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves