Which phrase defines an aquifer? a. the total amount of precipitation that falls on an area in a year b. the network of streams and rivers that flow into a large river c. a lake or a pond that is used to store water d. an underground geological formation that contains a large amount of water

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

i think a, hope it .

explanation: