The saturated zone is

When the levels of nutrients build up in a lake it's called

A ridge of land that separates watersheds is

The water cycle gets its energy from the

Most of the fresh water on Earth is

Wetlands have many organisms because of their supply of nutrients and

An aquifer lets people

A reservoir is used as

Groundwater is

Wetlands are natural

The water in ponds and lakes can be described as

Tributaries are

Three percent of water on earth is

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