Why does decreasing the volume of gas cause the pressure to increase if temperature is constant

What type of reaction fuels the processes seen here?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

28. which is not a reason that water is used to store spent fuel rods from nuclear power plants? water increases the speed of the chain reaction in the fuel rods. water protects nuclear power plant workers from the high temperature and radiation of the fuel rods. water acts as a radiation shield to reduce the radiation levels. water cools the spent rods. salts action