The forces that have shaped this region include collisions between continents, extension that stretched and fractured the Earth’s crust, volcanic eruptions, inundation by tropical seas, growth and decline of great deserts and lakes, and finally, sculpting of the land by water and wind. Evidence of these processes is dramatically displayed in Lake Mead National Recreation Area. 
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Geology of Lake Mead NRA home |
US Geological Survey home National Park Service home | Lake Mead NRA home Education resources | Technically speaking |
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