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Pastimes : NNBM - SI Branch -- Ignore unavailable to you. Want to Upgrade?

To: Clappy who wrote (31596)	1/15/2004 10:09:26 AM
From: Wharf Rat	Respond to of 104157

I didn't realize about not being able to blow them up. I may have to end up switching sites or something. See all the dark lines in the glaciers? As they move thru the mountains, they erode rocks on their edges, building up rubble next to the mountains, called moraines. When 2 glaciers meet, the lateral moraines along the meeting edges merge, becoming a medial moraine showing the original division between the two. The more medial moraines, the more glaciers have merged. In the Sierras, you see the rubble from the medial and terminal moraines, left when the glaciers retreated. It is happening up there, too. Ocassionally, you may spot a big boulder sitting on top of a glacier. These are called glacial erratics, and get picked up and carried along until the end of time, or the glacier, whichever comes first. You tend to see them in the Sierras, and also up here. There was one in Denali which was 4 stories high. I know I got a photo, which looks like it is about 2 inches tall, but I'll see if Malila took one, too. Sam McGee