What the River Knows: Virgin River, Utah

National Geographic – I flow out of a cave at 9,000 feet elevation near Navajo Lake at Cascade Falls, Utah, descend toward Lake Mead at 1,000 feet, and empty into the Colorado River. I could tell you tales of other parts of my course, but the favorite section of my journey is the 8½ miles through the steep Navajo sandstone canyon walls located in what is now called Zion Canyon.

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This Earth Day, a hydroplanet

  Viewed from space, as in NASA’s “Blue Marble” below, one quickly recognizes that water covers most of the earth’s surface. Even on land, the hydrologic cycle is responsible for its dominant features, from glaciers and rivers to jungles and deserts. Below the land surface, groundwater is found almost …

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