ERSC 1F90 Lecture 16: ersc1f90 review - april 13th
12 Sep 2016
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Document Summary
Glaciers, ice sheets and glacier landforms ice sheets. Ice sheets coverage: 10% of earth"s landmass, antarctica and greenland. Snowflake -> granular snow -> firn -> ice (minerals) Id layers by presence of: dust, sea salts, pollen, ash, radioactive isotopes from nuclear testing (1940"s) Ice flows -> glacier: cut u-shaped valleys, fjords. Types: horn, cirque, hanging valley, tarn, ar te, glacial trough, moraines, eskers, drumlins, kettle lakes, loess, till, erratics. Pre-cursor: lake duluth, lake algonquin: champlain sea: Was a temporary inlet of the atlantic ocean created by the glaciers during the last ice age: hudson bay. Glacial deposits: as a glacier melts, till is released from the ice into the water. Sediments deposited by glacial meltwater are called outwash. The outwash deposits are sorted and layered: economic (sand and gravel, drift prospecting. Greatest ice age (late paleozoic ice age: effected south america, asia, antarctica, india, australia, started 330 million years ago.
