River phrases Crossword

Most of the water you see flowing in rivers comes from precipitation __________.
If water flows to a place that is surrounded by higher land on all sides a ______ will form.
Rain falling on the land also seeps into the Earth to form ____________.
water obeys the rules of gravity and tries to get to the center of the _______.
the water cycle is _________ in progress.
If people have built a dam to hinder a river's flow, the lake that forms is a ___________.
Irrigation is a form of what?
water-bearing materials often exist in _____________ layers beneath the land surface.
Glacier melting in springtime causes _____ streamflows.
the Colorado River does not participate anymore in the natural _____________.