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2/8/19 Grand Canyon - versus - Rio Grande Rift

Which is more spectacular: The Grand Canyon or the Rio Grande rift?: a conversation with two geologists.

These two geologists, Karl Karlstrom and Laura Crossey, are experts in their field: Geological Society Distinguished Service Award, two TV series and one documentary, National Science Foundation grants, led the design and installation of "The Trail of Time" exhibition at Grand Canyon National Park and so much more.

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