Sentences with phrase «huge ice sheets covered»

Not exact matches

During the last ice age, much of North America was covered by a giant ice sheet that many scientists believe underwent several catastrophic collapses, causing huge icebergs to enter the North Atlantic — phenomena known as Heinrich events.

The discovery is significant in relation to the mechanism for rapid movement of the ice streams, which are huge, fast - flowing ice currents within the slow - moving ice sheet that covers most of Antarctica.

That the last little bit of ice in the arctic is melting, an ice sheet that once covered huge swaths of North America as far south as the US Rockies, upper Midwest and all of New England, is hardly proof that humans are changing the climate.

The time needed for ice sheets to respond to climate change is uncertain, and there are proponents for time scales covering a huge range.

Huge sheets of ice (glaciers) cover large parts of the Earth's surface.