Understanding How Antarctica Is Melting

The video discusses Antarctica's ice sheets, focusing on the Thwaites Glacier. While the eastern ice sheet is stable, the western sheet, particularly Thwaites, is melting and contributing significantly to global sea level rise. Thwaites acts as a barrier, preventing further ice flow into the ocean. Scientists have been studying the glacier, discovering that its grounding zone is eroding, making it more susceptible to warm water. If Thwaites collapses, it could lead to a dramatic rise in sea levels, affecting coastal cities worldwide.

What is the main reason the western ice sheet of Antarctica is unstable?

• It is mostly below sea level.

• It is made of thin ice.

• It is located above sea level.

• It is not affected by climate change.

How much does Thwaites Glacier contribute to the global sea level rise annually?

• 8%

• 2%

• 4%

• 6%

What did scientists discover about the bottom of the Thwaites Glacier using the Icefin robot?

• It was completely frozen.

• It was covered in algae.

• It was jagged and uneven.

• It was smooth and even.

What is the grounding zone's role in the movement of Thwaites Glacier?

• It accelerates the glacier's movement.

• It melts the glacier faster.

• It acts as a brace, slowing the glacier.

• It prevents the glacier from melting.

What could be the potential global impact if Thwaites Glacier disintegrates completely?

• A rise in global sea levels by 2 feet.

• A decrease in global sea levels.

• No change in global sea levels.

• A rise in global sea levels by 1 foot.