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And this is their story…..

And this is their story…. “Fast Times at Glacial High” ERIC MARCH. Glaciers. What is a glacier?. A glacier is a massive, long-lasting, moving mass of compacted snow and ice.

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And this is their story…..

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  1. And this is their story….. “Fast Times at Glacial High” ERIC MARCH

  2. Glaciers

  3. What is a glacier? • A glacier is a massive, long-lasting, moving mass of compacted snow and ice. • Glaciers can only form on land, wherever the amount of snow that falls in winter exceeds the amount that melts in summer. • There are two types of glaciers…

  4. Alpine Glaciers • Form on mountains because mountains usually have deep winter snowfall and the summers are short and cool. • This type exists on every continent, EVEN on the EQUATOR in Africa on Mount Kenya and in South America on Mount Cayambe. Mt. Kenya

  5. Continental Glaciers

  6. Miscellaneous Info • Did you know that… • Glaciers store about 75% of the world's freshwater. • Glacierized areas cover more than 15,000,000 square kilometers of the Earth. • Glacier ice crystals can grow to be as large as baseballs. • Glacial ice often appears blue because ice absorbs all other colors except blue; which is reflected. • Ice shelves may calve icebergs that are over 80 kilometers long. • Almost 90% of an iceberg is below water--only about 10% shows above water. • North America's longest glacier is the Bering Glacier in Alaska, measuring 204 kilometers long.

  7. Interesting Fact of the Day • Byron Glacier • Located in Alaska, On Mt. Alyeska • One hour south of Anchorage • Receding fairly quickly due to global warming • Tundra is slowly being replaced by larger plants.

  8. Glacial Movement • All glaciers can be thought of as rivers…just really big, frozen rivers! • Because all glaciers are moving, most at an average of 10 inches per day!

  9. Glacial Movement • Glaciers move two ways: • Basal Slip • Plastic Flow

  10. Basal Slip • The entire glacier slides over bedrock, much the same way that a bar of soap slides down a board

  11. Plastic Flow • The glacier deforms like a fluid as it moves downhill

  12. Plastic Flow • The glacier deforms like a fluid as it moves downhill

  13. Glacial Movement • Glaciers can move with both basal slip and plastic flow • Steep alpine glaciers will be mostly basal slip • Shallow continental glaciers will be mostly plastic flow

  14. Features of Moving Glaciers • Glaciers flowing over bumps in the bedrock produce crevasses

  15. Features of Moving Glaciers

  16. Glacial Erosion • Water freezes in gaps in the bedrock, freezes, and dislodges boulders that get swept up by the glacier and dragged along!

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