valley summary

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Below is the article summary. For the full article, see valley.

MoroccoThe rugged Atlas Mountains surround a valley in Morocco.

valley, Elongate depression of the Earth’s surface. Valleys are commonly drained by rivers and may be in a relatively flat plain or between ranges of hills or mountains. Valleys formed by rivers and slope denudation are typically V-shaped; those formerly occupied by glaciers are characteristically U-shaped. Valley evolution is controlled mainly by climate and rock type. Very narrow, deep valleys cut in resistant rock and having steep, almost vertical sides are called canyons. Smaller valleys of similar appearance are called gorges.

submarine canyon Summary

Submarine canyon, any of a class of narrow steep-sided valleys that cut into continental slopes and continental rises of the oceans. Submarine canyons originate either within continental slopes or on a continental shelf. They are rare on continental margins that have extremely steep continental

Valley of Ten Thousand Smokes Summary

Valley of Ten Thousand Smokes, volcanic region, southern Alaska, U.S., 265 miles (425 km) southwest of Anchorage. The valley was created in 1912 by the eruption of the Novarupta and Mount Katmai volcanoes. Its name derives from the myriad fumaroles (fissures spouting smoke, gas, and steam) that

Death Valley Summary

Death Valley, structural depression primarily in Inyo county, southeastern California, U.S. It is the lowest, hottest, and driest portion of the North American continent. Death Valley is about 140 miles (225 km) long, trends roughly north-south, and is from 5 to 15 miles (8 to 24 km) wide. The