youtor.org
Graduate Track for volcano in the Earth system research InVolc
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=rxJeY4C6SL4
UH-Hilo Geology Professor James L. Anderson demonstrates techniques researchers use for collecting samples of molten lava. If you're interested in studying geology, come earn your undergraduate degree here at the University of Hawaii at Hilo, where geology goes beyond textbooks. In general, scientists collect samples of molten lava for later analysis in the laboratory, to compare the chemistry from one eruption to the next, which provides clues as to the source of the magma supply below—is it fresh magma from the hot spot, or is it from an existing or evolving magma chamber, or a mixture? Samples of molten lava (2000 degrees F; 1200 C) are quenched in a can of water, and they immediately turn to glass; slower cooling would allow the lava to become rock. Note the scientists are wearing heavy-duty clothing, gloves, and boots for this operation. Some of the lava sampling shown here is more of a demonstration of viscosity of lava, especially the last scene, in which hardened crust is brought up on the rock hammer. This would never make an appropriate lab sample, but looks good on camera. Watch for the formation of Pele's Hair, which is lava stretched out in the wind into such thin strands that it forms volcanic glass; this is prominent at 1:07. Visit the UHH Geology web site for more details on our programs. http://www.hilo.hawaii.edu/~geology/
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