The process of water filling the porous spaces in the lithosphere.

Water that trickles through the soil and collects in pockets called aquifers.

This is also called thermal energy. This is heat from the sun that causes evaporation to happen.

When liquid water absorbs heat from the sun and turns into water vapor.

The changing of a gas back into a liquid which causes cloud formation.

Rain, snow, sleet and hail

This occurs when water flows over the land and doesn't absorb into the ground

This is the changing of water from a solid directly to a gas with no liquid stage in between.

This is also called a drainage basin. This is where rain or snow drains downhill into a particular body of water.

The high ground that separates two drainage basins.

Any substance that can harm the environment.

Pollution that can be traced back to its origin. Examples would be waste water from factories or sewage treatment facilities.

Pollution that cannot be traced back to its origin. Examples would be when rain water carries substances like lawn fertilizers, lawn chemicals, motor oil and animal waste into storm sewers or rivers.

These pollutants come from the use of organic fertilizers like manure in farming.

The rapid spread of algae in a water environment. This happens when too many nutrients enter the water.

Reducing your usage of water and finding ways to reuse your water.

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