State of the Greenland Ice Sheet

NASA scientists have been studying Greenland's ice for over a decade, using satellites and lasers to measure changes. They found that 100 billion tons of ice melt annually. The Peterman Glacier, a major ice chunk, has doubled its speed in five years, contributing significant freshwater to the ocean. This is part of a global trend, with 99% of Alaska's and 87% of Antarctica's glaciers retreating. The melting ice affects climate regulation, sea levels, and habitats, posing catastrophic risks if it continues.

How do NASA scientists measure the changes in Greenland's ice sheet?

• By drilling into the ice

• Through satellite and laser technology

• By using ground-based sensors

• Using underwater robots

What is the annual ice loss from Greenland's ice sheet?

• 150 billion tons

• 50 billion tons

• 100 billion tons

• 200 billion tons

What significant change has occurred with the Peterman Glacier in the last five years?

• It has become stationary

• It has decreased in size

• Its speed has doubled

• It has stopped moving

What percentage of Alaska's glaciers have retreated in the past 50 years?

• 50%

• 100%

• 75%

• 99%

What role does the planet's ice play in the environment?

• It only affects local climates

• It acts as a climate buffer and controls sea levels

• It has no significant impact

• It only provides habitats for polar animals