(Precipitation-Evaporation) is any form of water that falls to Earth from clouds

Water vapor is (visible-invisible).

Fog is a (cloud-vapor) that is close to or in contact with the ground.

Energy is transported to different parts of the Earth system in the water cycle when water changes (chemically-state).

Often, when water is absorbing energy, the energy comes from the (earth-sun).

Water we use on a daily basis for drinking and bathing typically comes from (ground-surface) water.

Surface water is used to (irrigate-fertilize) plants and operate hydroelectric dams.

If an area doesn't have access to surface water, they need to use (lake-groundwater) that is drawn up to the surface by a well.

The water cycle describes how water moves from the (ocean-atmosphere) to the surface of Earth and back again.

When precipitation flows across Earth's surface, it is called (runoff-rain).

(Rivers-Tributaries) are smaller branches of a larger stream into which they flow.

Streams are important because they (distribute-collect) water on the surface of Earth.

Faster streams tend to have (wider-straighter) channels than slow-moving streams.

The sediments and other materials carried by the stream, other than the water itself, make up the stream (load-deposit).

How fast a stream moves depends on the (pitch-gradient), or the steepness of the land which the stream flows over.

A stream with a (low-high) gradient will move slowly and only carry smaller sediment.

(Recharge-Discharge) describes the volume of water moved by a stream in a given amount of time.

Streams carve out (clefts-channels) in rock and soil due to the powerful force of water.

Watersheds are areas of (land-surface water) that are drained by streams.

16 Watersheds are separated by (tributaries-divides).

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