Why do scientists believe the polar ice is disappearing?
water pollution
global warming
garbage dumping
polar bears are breaking it up
What are the main causes of global warming?
emissions from cars and factories
discharge from water treatment plants
chemicals in the water
hazardous waste buried underground
How do polar bears use ice?
drinking water
food
means of travel
platform for hunting seals
What is one human activity that may be contributing most to melting of the ice?
dumping chemicals in water
driving cars
speeding up soil erosion
mining gold and silver
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