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

the bald eagle got 50 because everything gets 10% of what they consume and since 50 is ten % of 500 hundred that means the   grasshopper had to have consumed a plant with 5,000 calories of energy

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.