SETTLING NORTH AMERICA 1497 1732
NORTH AMERICAN EXPLORATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
It was covered by rising sea levels
|
|
|
It was washed away
|
|
|
It floated away
|
|
|
It was subducted back into the mantle
|
Detailed explanation-1: -As the climate warmed and the ice sheets and glaciers began to melt, water levels began to rise. The Bering Land Bridge was completely covered by rising sea levels 10, 000 or 11, 000 years ago, and its current water level was reached about 7, 000 years ago. To this day it remains under the Bering Sea.
Detailed explanation-2: -As the land bridge flooded, the entire Beringian region grew more warm and moist, and the shrub tundra vegetation spread rapidly, out-competing the steppe-tundra plants that had dominated the interior lowlands of Beringia.
Detailed explanation-3: -The land bridge measured about 1, 000 miles north-to-south at its maximum extent. Climate change at the end of the Ice Age caused the glaciers to melt, flooding Beringia about 10, 000 to 11, 000 years ago and closing the land bridge.
Detailed explanation-4: -As Earth warmed and its ice sheets began melting, the bridge became inundated around 11, 000 to 13, 000 years ago as it disappeared under the Bering Strait, the researchers said.
Detailed explanation-5: -This exposed land stretched one thousand miles from north to south. As the ice age ended and the earth began to warm, glaciers melted and sea level rose. Beringia became submerged, but not all the way.