Geography 2152F/G Lecture 6: Lecture 6 - GEO
22 Feb 2017
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Document Summary
Climate is a function of the interaction of many spheres atmosphere = gases hydrosphere = oceans, water lithosphere = plate tectonics, orogeny cryosphere = glaciers, ice sheets, snow cover biosphere = vegetation, animals, humans climate change. Earth has a 4. 6 billion year history. Several ice ages in the last billion years. Between ice ages, warm weather (warmer than today) Temperature change is not issue today, it is the rate of temperature change last glacial period. All of canada, except yukon was covered in ice. Bering land bridge was exposed recent history. Rapid rise in temperature in the last 100 years. Corresponds to the human industry and increase of greenhouse gases. Sun emits more energy during periods of high sunspot activity. Sunspot is a cool region of high magnetism on the sun - surrounded by faculae (bright areas that emit high amounts of energy) Occur in cycles, reach a maximum every 11 years.
