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The part that was covered is Northern Europe.
20,000-400,000 years, caused by formation and melting of ice sheets.
Most people don't even realize that Niagra falls was CREATED BY GLOBAL WARMING. 27,000 years ago the ice started melting, when it was all the way down to Georgia. By about 18,000 years ago, the sheets had melted so much that Niagra falls was created. Around 12,000 years ago, both with the land "Bouncing Back" from not having Miles of Ice Sheets on top of it AND the Ice Sheets making a resurgance, the falls stopped flowing, but resumed around 10,000 years ago, in 2 places and by around 5000 years ago, so much water had melted, that the second falls, (which was around 200 miles West) was completely covered in Water, leaving only Niagra. Even TODAY, 99% of Niagra falls flows from Melting "FOSSIL" Ice, in other words the Sheets are CONTINUING to melt, JUST as they have for the past 27,000 years!
Sheets
Because when they are showing them for sale, they are not covered in sheets.
The Sasquehanna or Susquehannock tribe lived in fortified villages of longhouses, each around 80 feet long and covered with sheets of bark.
The Sasquehanna or Susquehannock tribe lived in fortified villages of longhouses, each around 80 feet long and covered with sheets of bark.
isostatic rebound
Ice sheets covered almost all of Canada and parts of the United States, Europe, and South America during each of it's glacial advances.Enormous volumes of the world's water were frozen in these ice sheets.
It was covered in massive ice sheets!
Greenland is an island and Antarctica is a continent, both covered with ice sheets.
1) earths tilt, larger tilt will result in more sun to be directed at poles 2) melting of ice sheets (obvious ) 3) thermal expansion 4) carbon levels