Answer:
Please what is the question
<span>True, however 50% is rather optimistic value, it's probobally more. The main source of water is in the ground and the groundwater gets constantly more contaminated with road salt, oil, gasoline and other chemicals (and as you can see, these are all manmade products).</span>
In East Antarctica, the ice sheet is thicker and rests on bedrock that is above sea level in most places, whereas in the west the ice is not as thick and much of the underlying bedrock is below sea level. In addition to being the highest continent, Antarctica is also distinctive for being the coldest and the driest.
