What is one problem with production of coal? A. It is so expensive that manufacturers do not always make a profit.
B. It uses large amounts of water.
C. It produces CO2
D. It must be performed at very high temperatures.

i'll try what topic lol

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.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.