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Asthenosphere

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by

Rachel Welsh

on 21 March 2011

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Transcript of Asthenosphere

Asthenosphere Where is the Asthenosphere located? What is it made of? How hot is it? How thick is it? Well, these are just a few of the questions we will be answering for you today. You may be wondering... When was it discovered? It is 45-155 miles thick, or ~250 km. It is the semiplastic layer between mesophere and lithosphere. The asthenosphere is made of partially molten rock. It is considered "plastic." Magma is believed to be created here 1600 degrees Celcius In 1926 it was suspected, but it was accepted worldwide by studying data from seismic waves from the Chilean Earthquake of 1960. Let's break it down.

asthenes = weak + sphere Plastic = moveable The upper mantle: the
second layer of the Earth. What is the importance of it? Thicker or more shallow depending on where it is (shallow near ocean surface) The upper part of the asthenosphere is where the lithospheric plates move. HUH?! Continental Drift -
the breaking apart of Pangea about 100 million years ago to the current location of the continents Seismic waves slow down in this layer of the Earth. Cites:
http://www.infoplease.com/ce6/sci/A0805111.html

http://www.infoplease.com/ce6/sci/A0813370.html

http://www.britannica.com/facts/5/618730/asthenosphere-as-discussed-in-igneous-rock-geology

the lithlosphere. http://www.absoluteastronomy.com/topics/Asthenosphere

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