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In the desert region of the Southwest, finding enough ___________ for a growing population can be a challenge.
The ____________ lies on the border between Nevada and Arizona.
The Hoover Dam controls the flow of the ___________________.
It's reservoir, Lake Mead, provides most of ______________ water.
A layer of rock, sand, or gravel that absorbs water is called a ________________.
A human made lake is called a _____________.
An ________ is a large pipe or canal built to carry water.