Grand Canyon Volcanoes

When most of us think about the impressive geology of the Grand Canyon, our focus is on the ancient rocks. Within the past 1 million years, however, volcanoes have created striking displays in the canyon. Hot lava often flowed down the Colorado River channel for tens of miles; other times, it dammed the river, impounding water behind dams that eventually breached, sometimes releasing catastrophic floods.

By |2022-06-16T13:32:49-07:00June 16th, 2022|Our Amazing Earth|9 Comments

Obsessed with Obsidian

Obsidian, smooth and shiny black volcanic glass, has fascinated humans for tens of thousands of years. Researchers believe that humans have a natural reaction to shininess that is tied to an innate need–specifically, water. The Eastern Sierra Nevada is a fabulous place to see dark obsidian, especially in areas where it is swirled and folded together with frothy pale gray pumice..

By |2021-07-22T16:25:50-07:00July 22nd, 2021|Our Amazing Earth|10 Comments

Geysers in the Americas

Geysers, with hot water and steam welling up from deep underground, are mysterious clues to what lies beneath. Yellowstone National Park includes about half of all geysers found on Earth. The Andes Mountains contain a major geyser field, named El Tatio, in northern Chile......I recently dug around for more information about geysers – and I found some that was new news to me and, I think, quite interesting.

By |2020-10-17T06:08:39-07:00October 15th, 2020|Our Amazing Earth|4 Comments

Yellowstone’s Dynamic Geologic History

The dramatic landscape of Yellowstone National Park, including exploding geysers, bubbling mud volcanoes, and rainbow-colored lakes, all provide hints of the dynamic geologic history of the region. Yellowstone is one of the Earth’s largest volcanic systems, and earthquakes, ground surface movements, and hydrothermal activity in the region are all indications of this volcanism.

By |2020-10-11T06:31:01-07:00October 8th, 2020|Our Amazing Earth|0 Comments
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