Vary in the number of neutrons but Sama in the number if protons are called isotopes
The process responsible for this is mass movement.
Answer:
Groundwater rises, adding water to rivers.
Explanation:
Tributaries combine, adding water to rivers.
Ice sheets melt slowly, adding water to rivers.
Rainfall in an area increases, adding water to rivers.
A biological community of interacting organisms and their physical environment.
