What happened to the Arctic Ocean during the past 40 years? (1 point)
• It has gained more sea ice.
O It has become warmer
• It has become cooler
• It has grown smaller
• It has lost significant amounts of sea ice, leading to increased warming and changes in the ecosystem.
How much of Earth is comprised of ice? (1 point)
• about 90 percent
• about 10 percent
• about 30 percent
• about 70 percent
• about 10 percent
Which feature of Earth would reflect the greatest amount of incoming sunlight? (1 point)
• ice covered by snow
• light ocean water
• sea ice
• dark ocean water
• ice covered by snow
What is the effect of changing temperature on the Arctic Ocean as observed by scientists over the last few decades? (1 point)
• There are more areas of open ocean.
• There are no changes in temperature.
• There is less saltwater.
• There is more sea ice.
• There are more areas of open ocean.
Why has the temperature of the Arctic Ocean changed during the last 40 years? (1 point)
• More sunlight now reaches Earth than in the past.
• Less snow falls in the Arctic now than 40 years ago.
O Sea ice has produced more salt, causing the cold ocean water to sink.
• Sea ice has melted, allowing more sunlight to hit the ocean.Why has the temperature of the Arctic Ocean changed during the last 40 years? (1 point)
• More sunlight now reaches Earth than in the past.
• Less snow falls in the Arctic now than 40 years ago.
O Sea ice has produced more salt, causing the cold ocean water to sink.
• Sea ice has melted, allowing more sunlight to hit the ocean.