The geologic processes behind famous US National Park features, such as canyons, geysers, and glaciers, one feature per card.
35 cards · basic cards · AI-written, checked twice. Edit anything.
- What geologic process, powered by an underground hotspot, produces Yellowstone's hot springs and geysers?
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Volcanic and geothermal activity- What term describes a periodically erupting hot spring like Old Faithful?
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A geyser- What underground magma feature beneath Yellowstone is sometimes described in media as a 'supervolcano'?
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The Yellowstone hotspot (Yellowstone Caldera)- What carved the Grand Canyon's mile-deep layers over millions of years?
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Erosion by the Colorado River- What do the exposed rock layers of the Grand Canyon reveal about Earth's history?
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Nearly two billion years of geologic history in layered rock strata- What natural process carved Arches National Park's sandstone into freestanding arches over time?
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Erosion by water, ice wedging, and wind on porous sandstone- What underground salt layer, deposited by an ancient sea, contributed to the formation of Arches' rock formations?
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An ancient salt bed (the Paradox Formation)- What volcanic collapse event, about 7,700 years ago, created the basin that filled with water to form Crater Lake?
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The eruption and collapse of Mount Mazama- What term describes the type of volcanic depression that now holds Crater Lake?
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A caldera- What freeze-thaw process breaks rock apart to form Bryce Canyon's hoodoos?
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Frost wedging- What softer and harder rock layers combine to give hoodoos their irregular, top-heavy shapes?
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Alternating layers of soft and hard rock that erode at different rates- What tectonic activity is responsible for uplifting the granite that forms Yosemite's cliffs and domes?
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Uplift of the Sierra Nevada batholith (granite intrusion)- What glacial process carved Yosemite Valley into its distinctive U-shape?
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Glacial erosion (glacial carving)- What limestone dissolution process created the vast chambers of Carlsbad Caverns?
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Sulfuric acid dissolving limestone from below, a process called speleogenesis- What mineral formations, built up drop by drop from dripping water, decorate caves like Carlsbad and Mammoth?
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Stalactites and stalagmites
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