How Do Ice Ages form? Changes in the earth's orbit cause less sunlight to fall on the northern hemisphere during summer Northern ice sheets melt less.

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Presentation transcript:

Mitchell White Hunter Broersma Aj Ringelberg Glacier History Mitchell White Hunter Broersma Aj Ringelberg

How Do Ice Ages form? Changes in the earth's orbit cause less sunlight to fall on the northern hemisphere during summer Northern ice sheets melt less during summer and gradually grow over thousands of years. Earth's albedo is increased which amplifies the cooling, spreading the ice sheets farther. This process lasts around 10,000 to 20,000 years, bringing the planet into an ice age http://upload.wikimedia.org/wikipedia/commons/b/b0/Glacial_lakes.jpg

History about Glaciers -Glacier: Large river of ice that flows through a landscape -There have been 4 ice ages -until 4000 years ago we were under Lake Michigan-outwash plain

Glacial Timeline Time (1000yrs) 0-18 Interglacial 18-67 Wisconsin 67-128 Interglacial 128-180 Illinoisan 180-230 Interglacial 230-300 Kansan 300-330 Interglacial 330-470 Nebraskan -

Background History -The Upper Peninsula is comprised of the oldest landforms in Michigan. -The Canadian Shield dates to Precambrian time (2.5-2.7 billion years ago) this shield forms the northern boundary of the U.P.

Sick Vid https://www.youtube.com/watch?v=ibTWQogsbL8

Canadian Shield After the Canadian Shield formed Michigan, it had a succession of ecosystems varying from ancient sea, which gave us our limestone base, to tropical forests.

Canadian Shield….. JK lol ;)

The Real Canadian Shield Present-day North America was underwater during the Precambrian era . Limestone, sandstones, and shales were deposited on top of the Precambrian deposits North America was periodically covered by shallow seas or received sediments from higher ground.

Works cited http://blogs.monashores.net/buskens/files/2009/03/michigan-glacial-history-landforms.pdf http://upload.wikimedia.org/wikipedia/commons/b/b0/Glacial_lakes.jpg