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Topic: Earth History (Read 3170 times)
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Crystal Thielkien
Superhero Member
Posts: 4531
Re: Earth History
«
Reply #15
on:
January 08, 2009, 01:41:36 pm »
The Earth has been in an Ice House Climate for the last 30 million years
When the Earth is in its "Ice House" climate mode, there is ice at the poles. The polar ice sheet expands and contacts because of variations in the Earth's orbit (Milankovitch cycles). The last expansion of the polar ice sheets took place about 18,000 years ago.
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Crystal Thielkien
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Posts: 4531
Re: Earth History
«
Reply #16
on:
January 08, 2009, 01:42:17 pm »
The Present-day world has well defined climatic zones.
We are entering a new phase of continental collision that will ultimately result in the formation of a new Pangea supercontinent in the future. Global climate is warming because we are leaving an Ice Age and because we are adding greenhouse gases to the atmosphere.
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Crystal Thielkien
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Posts: 4531
Re: Earth History
«
Reply #17
on:
January 08, 2009, 01:42:55 pm »
This is the way the World may look like 50 million years from now!
If we continue present-day plate motions the Atlantic will widen, Africa will collide with Europe closingthe Mediterranean, Australia will collide with S.E. Asia, and California will slide northward up the coast to Alaska.
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Crystal Thielkien
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Posts: 4531
Re: Earth History
«
Reply #18
on:
January 08, 2009, 01:43:35 pm »
The Atlantic Ocean begins to Close
New subduction zones along the eastern coasts of North America and South America will begin to consume the ocean floor separating North America from Africa. About 100 million years from now the present-day Mid-Atlantic Ridge will be subducted and the continents will come closer together.
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Crystal Thielkien
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Re: Earth History
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Reply #19
on:
January 08, 2009, 01:44:20 pm »
"Pangea Ultima" will form 250 million years in the Future
The next Pangea, "Pangea Ultima" will form as a result of the subduction of the ocean floor of the North and South Atlantic beneath eastern North America and South America. This supercontinent will have a small ocean basin trapped at its center.
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Crystal Thielkien
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Re: Earth History
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Reply #20
on:
January 08, 2009, 01:44:38 pm »
http://www.scotese.com/earth.htm
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