When gravity causes water to flow downhill as surface water instead of soaking into the ground; this is called ________.

The top of the zone of saturation is called the _____ _____.

The area that groundwater is stored is called a(n) _____.

An area that is drained by a river and all the streams that empty into it, the tributaries, is called a

The high ground between two drainage basins.

These form where the river ends its journey into a still body of water like a lake or the ocean

These have been placed along some rivers in order to produce hydroelectric power and to offer recreation in the lakes

Earth is 71% water with _____ freshwater.

Resources are replaced through natural processes at a rate that is equal to or greater than the rate at which they are being used. Air, freshwater, soil, living things, and sunlig

Resources are exhaustible because they are being extracted and used at a much faster rate than the rate at which they were formed.

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