Tephra is a general term for all fragmented material produced and ejected into the air during a volcanic eruption. This includes everything from fine volcanic ash and dust to medium-sized lapilli and large volcanic bombs. Once tephra falls to the ...
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The Mexican Plateau is an intermontane plateau because it is enclosed by mountain ranges on its eastern and western sides: the Sierra Madre Oriental and the Sierra Madre Occidental. It sits at a high elevation and occupies the bulk of ...
The Colorado Plateau is the site of the Grand Canyon, carved by the Colorado River. This plateau is a massive, stable uplifted block. As the land rose over millions of years, the river cut down through the layers of rock, ...
A Guyot (or seamount) is an isolated, flat-topped submarine mountain. Geographically, they are the plateaus of the ocean floor. They were originally volcanic islands that were leveled by wave erosion at the sea surface and subsequently submerged as the ocean ...
A Hogback is a narrow, sharp-crested ridge formed by the differential erosion of steeply tilted rock layers. Both sides of the ridge have nearly equal, steep slopes. They are commonly found on the flanks of large-scale folds or domes, where ...