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Author Topic: How quickly does molten rock cool?  (Read 6469 times)

jeffrey owen

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How quickly does molten rock cool?
« on: 17/06/2008 09:38:40 »
jeffrey owen  asked the Naked Scientists:

hi

how long would it take for molton rock (magma) to cool down and safe to touch,

Jeff, Southminster

What do you think?


 

Offline Bass

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How quickly does molten rock cool?
« Reply #1 on: 17/06/2008 17:16:42 »
It depends.

The type of molten material, whether it is extrusive or intrusive, and the surrounding environment will all affect how quickly it cools.

Basalt lava erupted into the ocean, typically forming "pillows", cools very quickly, and can probably be approached within minutes (as long as the next pillow doesn't erupt above it).  Basalt lava on land also cools quickly, forming a skin that probably cools in a matter of hours or days.  Silicic lavas generally cool more slowly.
Intrusive magma (does not reach the surface), like granite, can take millions of years to cool.
 

Offline Alan McDougall

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How quickly does molten rock cool?
« Reply #2 on: 08/07/2008 00:19:53 »
Very much like toffy, it cools rapidly, when exposed to the atmosphere

Alan
 

Offline tangoblue

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How quickly does molten rock cool?
« Reply #3 on: 11/03/2009 19:48:45 »
i think it really depends on where the lava is.
 

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How quickly does molten rock cool?
« Reply #3 on: 11/03/2009 19:48:45 »

 

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