Tuesday, July 14, 2015

Alaska's glaciers - Hubbard glacier - Yakutat Bay

Hubbard Glacier

Here is some information about glaciers that I read in a book from the board library:

Glaciers are thermodynamic systems that
1. absorb precipitation and rock debris
2. get stirred around by gravity, solar energy and geothermal heat
3. spit out water and rock

A glacier is a moving river of ice.

Glacial flour is the fine powdery dust that imparts a milky appearance to water flowing below glaciers.

The classic U-shape is a clue that glaciers, not streams, carved a valley.

Why does the ice look blue?
When light hits highly compete glacier ice, long wavelength colours like red are absorbed, while short wavelength colours like blue reflect back through the ice to your eyes.

Alaska was purchased from Russia in 1867 for just below two cents per acre.

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