How did the Appalachian Mountains erode over millions of years?

The Appalachian Mountains are one of the oldest surviving mountain ranges in the world, having formed through a series of orogenies beginning about 480 million years ago. After reaching elevations once comparable to the Alps or Rockies, 240 million years of natural erosion by water, wind, ice, and gravity gradually shaped them into their current lower, rugged form. In more recent times, human activities such as intensive agriculture have vastly accelerated this natural erosion rate in specific areas.

What we know

• The modern Appalachian Mountains were created by a series of three distinct orogenies that started approximately 480 million years ago. [4]
• Over 240 million years of natural erosion by water, wind, ice, and gravity gradually morphed the young, high Appalachians into lower, rugged peaks. [4]
• At agricultural sites in the Appalachian Mountains, intensive farming practices have caused soil erosion at up to 100 times the natural regional rate. [5]
• Erosion involves the removal of soil, rock, or dissolved material from one location and transporting it elsewhere via agents like water flow, wind, or ice. [5]

Where to go next

• what caused itWhat caused the formation of the Appalachian Mountains?
• what followedHow does human activity accelerate soil erosion globally?
• how it workedWhat physical processes drive the mechanical erosion of rock?
• a case in pointWhat are Appalachian balds and why do they lack trees?
• the bigger pictureHow do the Blue Ridge Mountains fit into the greater Appalachian range?
• an unexpected connectionHow are the Appalachian Mountains related to the Scottish Highlands?The Appalachians and the Scottish Highlands originally belonged to the same ancient supercontinent range called the Central Pangean Mountains before plate tectonics tore them apart.

Sources

• [1]bald (Wikidata Q2858591) · CC0 1.0
• [2]Appalachian balds · CC BY-SA 4.0
• [3]Blue Ridge Mountains · CC BY-SA 4.0
• [4]Appalachian Mountains · CC BY-SA 4.0
• [5]Erosion · CC BY-SA 4.0

Your path

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