Wednesday, December 10, 2008

science lecture update

To answer Dick's how did water get there question. They don't have a definitive answer but there are 2 main theories.
The first is that it's a very briny saltwater from mineral leaching. This lowers the freezing point enough that it can stay liquid
the 2nd theory is a bit more interesting. When ice is compressed some of it will turn to liquid. ski's and ice skates actually glide over a microscopic layer of water produced from the weight of the skater and the friction of moving across the ice. They extrapolated that theory out in a couple of directions. they think that the weight of the ice sheet pressing down helped create a layer. that's combined with the thermal insulation provided by miles of ice (think igloos it can be -40 outside and 32 inside) and then add on geothermal heat from the earth's crust could cause liquid to form.
Hope that helps

2 comments:

Anonymous said...

HI Clay, Just got back from California, shuttle landed there and it was my time to go so I have been catching up on your travels. Your expedition sounded very interesting, however I agree a few eeew factors there, and from the sounds of it I would guess that there were not any females on that trip ie: nalgene bottle relief. So now who is at the camp that you help set up? Cold here again I have my fireplace going!!!! Shari

Unknown said...

Hey Clay, The weather is hitting hard here. It was under 22 degrees ALL day. Dad wonders if that is preparation for your climate.