 | Natchez Trace Parkway - Loess Bluffs
The loess bluffs along the Natchez trace were formed by ancient winds which deposited thick layers of glacial dust along the banks of the Mississippi.
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| Hidden Springs of Big Bend
Although small and spread throughout the desert landscape, freshwater springs are an important oasis of life for plants, animals and humans.
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| Alabama's Wetumpka Impact Crater
Geologists studying Alabama's terrain noticed a peculiar, 'structurally disturbed' area; upon further study, it was thought to be an impact crater.
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| The Wetumpka Asteroid
By examining the impact crater around Wetumpka, Alabama, scientists have determined the nature of the asteroid impact that occurred millions of years ago.
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| Mount St. Helens - Blast Zone
The cataclysmic eruption of Mount St. Helens in 1980 left vast scars on the landscape still obvious today.
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| Mount Edgecumbe, Alaska
Alaska's Mount Edgecumbe, now apparently peaceful, was once a center of violent volcanic activity.
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| Missoula Flood - Part 1
During the ice age, glacial ice dams across the Northwest caused rivers to flood on a massive scale, leaving topography that resembles a giant riverbed.
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| Missoula Flood - Part 2
The effects of the ice age floods across much of the Northwest can most readily be seen from the air.
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| Missoula Flood - Part 3
During the ice age, the Missoula Flood transported vast amounts of rich soil from eastern Washington to western Oregon.
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| Bridge of the Gods
Hundreds of years ago a massive landslide blocked the Columbia River, disrupting the lives of all those nearby.
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