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It's the Siachen glacier, located somewhere in the Kashmir region (India/Pakistan/China). It's important since it's one of the sites of territorial conflict between India and Pakistan, and the conflict - the heat and stuff generated from the military operations - sped up its retreat to 110 meters a year as of now.

What are D-O events, how are they caused, what are they like, and how do they effect the cryosphere?

Not sure I know the answer to all the parts. Here goes:

D-O stands for Dansgaard-Oeschger event. It is the phenomenon where global temperatures rapidly warm following a glacial period. I would assume they are a byproduct of the Milankovitch Cycle, but not positive what specifically about them causes it. As said before, they lead to massive warming, thus rapid retreat of glaciers, ice sheets after a glacial maximum.

Belated affirmative to my previous question.

Plover, I think that's your cue to post the next question...you got the last one right, after all

Whatever, here goes.
the first ice core ever drilled to the bottom of an ice sheet was located where?

God dammit! Why can I never answer your questions

If Google is reliable, I think the first ice core to hit bedrock was drilled in Byrd Station, Antarctica in 1968. The first one in Greenland (from my searching) that I could find was part of the GISP project and hit bedrock in 1991.

Heinrich events, where massive amounts of icebergs break off from glaciers, occur when? Is the temperature warm or cold? How do these events affect the oceans?

The answer I was actually looking for was Camp Century, but I'll let you have it.

Also, I'll let someone else answer the next question :p

Oh well, I'll post the next question:

Why is the Variegated Glacier important to glaciologists? Also, where is Variegated Glacier located?

it is important becuase it surges every 20 years and its located in Svalbard, Candidian Artic Islands, Alaska, and Ice Land

sorry for the spelling errors