Changing Polar Ice: Observations and Concerns

The video discusses the characteristics and changes in the polar ice regions, focusing on the permanent and seasonal ice packs. It highlights the diminishing extent of polar ice, particularly in the Arctic and Greenland. Researchers are studying the increasing rate of ice loss by analyzing melt water in Greenland's ice sheet. The video also covers the significant loss of Arctic sea ice, which exceeded predictions in 2007, and the increase in glacial earthquakes in Greenland, suggesting accelerated glacier flow due to extra melt water.

What is the typical thickness range of the Arctic ice pack?

• 1 to 2 meters

• 7 to 8 meters

• 3 to 4 meters

• 5 to 6 meters

What is the estimated area covered by the northern polar ice pack?

• 1 to 3 million square kilometers

• 4 to 6 million square kilometers

• 15 to 18 million square kilometers

• 9 to 12 million square kilometers

What is the main focus of researchers studying the Greenland ice sheet?

• The thickness of the ice sheet

• The color of the ice

• The depth and color of meltwater lakes

• The temperature of the ice

How much did the Arctic sea ice decrease in the summer of 2007 compared to the 1980s levels?

• 30%

• 40%

• 10%

• 20%

What phenomenon has increased in Greenland since 1993, indicating accelerated glacier flow?

• Glacial earthquakes

• Volcanic eruptions

• Tsunamis

• Hurricanes