Ice AgesBy: Nick, Scott, & Sam

Legend–wait for it–dary video

Ice Age The Movie

Louis Agassiz

•Swiss naturalist

•Theory (p. 421)

•Not much support for his ideas in Europe

•Agassiz in America (p. 423)

Glacier Theory of 1800 (3 levels)• 1. Alpine glaciers - Modern glaciers in the Swiss

Alps and Norway had once extended farther down their valleys than today

• 2. Mountain ice caps - Glacier cover in the Swiss Alps and Norway had once been much thicker and had ice caps

• 3. Continental Ice Sheets - Vast sheet of ice spread from the Arctic and covered all of Europe as far south as the Mediterranean

Milutin Milankovitch

•Suggested that Ice Ages have to do with the movement on the Earth (p. 424-425)

•Köppen continued on Milankovitch’s ideas (p. 426)

Glacial Map

Glaciers• Largest moving objects

on Earth

• Massive rivers of ice that form in areas where more snow falls each winter than melts each summer

• Glaciers and their Effects

Global Warming Theory #1• Global sea level has

already risen by 4 to 8 inches in the past century

• Arctic summers could be ice-free by 2040, and sea levels could rise as much as 23 inches by 2100 if current warming patterns continue

• Global Warming - Glacier Melt

Global Warming Theory #2

•Global warming may actually cause an ice age

•Theory (p. 431)

Could This

Cause This?

Bibliography

•http://academic.emporia.edu/aberjame/histgeol/agassiz/glacial.htm

•http://science.howstuffworks.com/environmental/earth/geophysics/glacier.htm

•http://www.nrdc.org/globalwarming/fcons/fcons4.asp