What are ice cores from greenland and antarctica used for?

Explanation:

Ice core is a sample of ice drilled from ice sheet of high mountain glacier, particularly in Greenland and Antarctica. The drill can be depth of 3.2km . The ice core can be used to know how the ice spreading during glacial and interglacial period. The ice core can tell us about past climatic information and also the possible track of future climatic change.

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;