RUNOFF
The movement of water on a surface to areas of lower elevation.
ACCUMULATION
A buildup or gathering of something that occurs over time.
PRECIPITATION
Rain, snow, sleet, and hail that falls from clouds in the sky.
CONDENSATION
Physical change in matter from a gas to a liquid.
EVAPORATION
Physical change in matter from a liquid to a gas.
WATERCYCLE
The constant movement of water through the land, air, oceans, and living things.
SALT WATER
Water found in oceans (and few lakes) that contains 3-4% salt.
FRESH WATER
Water found in rivers, lakes, glaciers, ice sheets, and underground that contains low concentrations of salt.
OCEAN
The entire body of saltwater that covers about 71% of Earth.
GROUND WATER
Water that collects in cracks and pores in underground soil and rock layers.