Question

name the important river flowing through the appalachain mountain​

Answer 1

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Hudson River

Answer 2

Answer:

Geology

The Appalachians are among the oldest mountains on Earth, born of powerful upheavals within the terrestrial crust and sculpted by the ceaseless action of water upon the surface. The two types of rock that characterize the present Appalachian ranges tell much of the story of the mountains’ long existence.

First there are the most ancient crystalline rocks. Between about 1.1 billion and 541 million years ago, during the Precambrian era, long periods of sedimentation and violent eruptions alternated to create rocks and then subject them to such extreme heat and pressure that they were changed into sequences of metamorphic rocks. Among the oldest of these are the gneisses. Limestone changed into marble, shales became slate and schist, sandstones were transformed into quartzite, and intrusions of magma formed bodies of granite. These ancient rocks antedated most plant or animal life; in addition, the intense pressure and heat destroyed any traces of primitive life—so that the Precambrian crystallines contain no trace of fossils. They make up what is known as “Old” Appalachia in Canada, New England, and a belt east of the Great Valley with the Blue Ridge at its heart.

To the west the Great Valley, the Valley Ridges, and the Appalachian Plateau (including the Alleghenies) are characterized by the second type of rocks, sediments of Paleozoic age (i.e., about 252 to 541 million years old). These make up “New” Appalachia—the shales, sandstones, limestones, and coals that were formed as sediments were deposited, stratified, and solidified over geologic time. During the Carboniferous Period (358.9 to 298.9 million years ago), this long process included the formation of some of the richest coal beds in the world. During the Permian Period (298.9 to 252.2 million years ago), a great mountain folding occurred. This was the Appalachian Revolution, a vast interior crumpling resulting from the stress placed on huge masses of subterranean rock. As parts of the Earth buckled into folds, cracked, and faulted, other parts were uplifted—sometimes in the parallel ridges distinctive of the Appalachians—and thrust faults served to move one rock mass atop another. Thus, the ancient crystallines were lifted in places above the more recent sedimentary rock deposits.

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