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easy one, whats a tarn?

A tarn is a type of lake formed when in a cirque basin carved out by a glacier.

What is the minimum thickness for ice to flow?

nomynameisnotkevin wrote:A tarn is a type of lake formed when in a cirque basin carved out by a glacier.

What is the minimum thickness for ice to flow?

I think the answer to this question at Palatine was 30 m, yes? That one was weird - you got 2 pts if you chose 30 m, 1 pt if you chose 50. The more common answer I've seen is 40 or 50 m

In the few textbook chapters on glaciers I've read, I've consistently seen 50m.

I also have a question if anybody can help me out; I'm looking for practice problems on glacial mass balance and chart interpretation-- never figured out how to do that last year but now I need to learn, it's killing my scores. For example, if given a table of data titled simply "Glacial Mass Balance, years, glaciers, no units, and a list of positive and negative numbers.... Blah. Are the numbers +/- from each previous year?? As in, if 1995 is -0.07 and 1996 is -0.01, is the total cummulative loss in mass balance -0.08, or -0.01 from the total throughout that year? (if that makes sense...)I'm assuming here that (-) refers to a loss in glacial mass balance (so ablation>accumulation) but I also want to be sure about that.

If anybody could help me out in this department, I'd appreciate it, thanks.

4n6-Chick-1995 wrote:In the few textbook chapters on glaciers I've read, I've consistently seen 50m.

I also have a question if anybody can help me out; I'm looking for practice problems on glacial mass balance and chart interpretation-- never figured out how to do that last year but now I need to learn, it's killing my scores. For example, if given a table of data titled simply "Glacial Mass Balance, years, glaciers, no units, and a list of positive and negative numbers.... Blah. Are the numbers +/- from each previous year?? As in, if 1995 is -0.07 and 1996 is -0.01, is the total cummulative loss in mass balance -0.08, or -0.01 from the total throughout that year? (if that makes sense...)I'm assuming here that (-) refers to a loss in glacial mass balance (so ablation>accumulation) but I also want to be sure about that.

If anybody could help me out in this department, I'd appreciate it, thanks.

I believe what you're talking about is the ablation/accumulation of glaciers. If they have various #'s, and if they give them as positive or negative, then that means that you're either gaining mass or losing it by various means, such as wind scour, etc.

Crazy Puny Man wrote:

nomynameisnotkevin wrote:A tarn is a type of lake formed when in a cirque basin carved out by a glacier.

What is the minimum thickness for ice to flow?

I think the answer to this question at Palatine was 30 m, yes? That one was weird - you got 2 pts if you chose 30 m, 1 pt if you chose 50. The more common answer I've seen is 40 or 50 m

Bingo. I was just wondering if 50 or 30 was more common.

Well, considering the zone of plastic flow begins at about 50 m, that would have been my guess.

Oops, my turn isn't it?

What is the difference between a randkluft and a bergschrund?

bergschrunds are higher and have two ice walls

I think scienceandsmiles was supposed to ask the next question?
Anyhoo I have one that my partner and I encountered on a practice test: What is basal sliding? When does it occur?