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2 years, 10 months ago via Twitter

How many years can a mountain exist before it's washed into the ocean?

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badaspie | 2 years, 10 months ago view on twitter
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All mountains (at least on Earth) undergo constant weathering and erosion from multiple sources, including chemical weathering, freeze-thaw cycles, glaciation, running water, wind, and gravity (resulting in landslides, slumping, etc.). The amount of time it takes for a particular mountain to be eroded flat depends on the volume of the mountain (the amount of rock to be eroded) and the erosion resistance of the rocks that make up the mountain.

http://www.mountainnature.com/geology/Erosion.htm

The ages of some mountain ranges include 50-100 million years for the Rocky Mountains (still tall and jagged), about 480 million years for the Appalachians (low and rolling), and over 3 billion years for the Barberton greenstone belt in South Africa.

http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_rocky_mountains.html
http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_appalachians.html
http://www.sciencemall-usa.com/bagr.html

Rocky Mountains:

http://www.istockphoto.com/file_thumbview_approve/5118571/2/istockphoto_5118571-rocky-mountains.jpg

Appalachian Mountains:

http://www.marietta.edu/~biol/biomes/images/alpine/mtopview.jpg

Barberton greenstone belt (foreground):

http://www.iml.rwth-aachen.de/projekte/2int.jpg

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snawitz | 2 years, 10 months ago view on twitter
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Isn´t your question a phrase from a song?

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aogwarrior | 2 years, 10 months ago view on twitter
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I don't believe mountains have an average "lifespan" so to speak, they just exist until something cataclysmic causes them to be destroyed (such as a volcano ripping the mountain itself apart, a meteor flattening it, or a truly massive flood pulling it apart). I would also tend to suspect that most mountains do not wash into the ocean, as most mountain ranges are not right at shorelines or anywhere withing a few miles of the shore (at least not to my knowledge).

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