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?
- Volcanic and geothermal activity
- What term describes a periodically erupting hot spring like Old Faithful?
- A geyser
- What underground magma feature beneath Yellowstone is sometimes described in media as a 'supervolcano'?
- The Yellowstone hotspot (Yellowstone Caldera)
- What carved the Grand Canyon's mile-deep layers over millions of years?
- Erosion by the Colorado River
- What do the exposed rock layers of the Grand Canyon reveal about Earth's history?
- 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?
- 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?
- 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?
- The eruption and collapse of Mount Mazama
- What term describes the type of volcanic depression that now holds Crater Lake?
- A caldera
- What freeze-thaw process breaks rock apart to form Bryce Canyon's hoodoos?
- Frost wedging
- What softer and harder rock layers combine to give hoodoos their irregular, top-heavy shapes?
- 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?
- Uplift of the Sierra Nevada batholith (granite intrusion)
- What glacial process carved Yosemite Valley into its distinctive U-shape?
- Glacial erosion (glacial carving)
- What limestone dissolution process created the vast chambers of Carlsbad Caverns?
- 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?
- Stalactites and stalagmites