Evaporation - liquid water becoming a gas

Water Vapor - water as gas in the air

Condensation - water vapor becoming a liquid

Surface Runoff - water that runs along the surfaces and goes into lakes & rivers

Precipitation - rain

Groundwater - water under the ground, as in a spring or bore hole

Aquifer - a large water source under the ground

Percolation - water moving downward through openings in the soil