to use up so that there is little or nothing left

water found underground in soil or rock

a way to supply water to land or crops

things that exist in a region and can be used to provide for people

a rule or law that limits something

to provide what is needed to continue doing something

to make something smaller in amount

describing a cause that is not the most important one

to become smaller or decrease

in a way that is important or large enough to make a difference

something that is necessary

a need or requirement

a group of related items that work together to do something

a series of actions taken to make or do something