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Deeper cores require more equipment, and the borehole must be filled with drill fluid to keep it open.

The drill fluid used is normally a petroleum-derived liquid like kerosene.

Melt layers are formed when the surface snow melts, releasing water to percolate down through the snow pack.

They form bubble-free ice layers, visible in the ice core.

For example, melt layers are related to summer temperatures.

Last modified 06-Jul-2015 04:04