Water above the surface of the land, including lakes, rivers, streams, ponds,

when rocks are exposed to weather change and break down

the breaking down of rocks by chemical ways ( rain, oxygen)

the breaking down of rocks into small pieces from something moving it. ( water, animals, plant roots)

when weathered material is moved and carried to a new place.

wind, water, glacier, gravity

when the weathered material is dropped in its new place.

the top of ground water

allows water to go through it

does not allow water to go through it

the release of harmful materials into the environment

an area of land that drains into a river, lake, or ocean

separate watersheds

a body of rock that stores groundwater

water underneath the ground

water that flows over the surface of the ground

pollution from a specific source

pollution from many sources

the down movement of water

when nutrients build up in a lake or pond and cause plant life to grow and animals to die from lack of oxygen.