Layers of mud made mostly of tiny shells and calcite crystals form the soft rock chalk. Why does this happen?

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

Maya wrote if you step to describe how carbon circulates between the atmosphere and living organisms