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What is an iceberg? Why are they blue or green?
An iceberg is a large floating block of freshwater ice that has broken off the edge of a glacier and been carried out to sea; about 90% of its mass lies under the water. The bluish streaks of clear, bubble free ice often seen in icebergs results from the refreezing of melt water which fills crevasses formed in the glacier as it creeps over land. The ice is blue because of the natural light scattering characteristics of pure ice. Occasionally airborne dust or dirt eroded from land ends up on the glacier surface eventually forming a noticeably darkened brown or black layer (in any orientation) within the ice of a floating iceberg.

What type of information can scientists obtain from polar ice?
Polar Regions and some alpine areas are sufficiently cold that snowfall accumulates from year to year, building up as glaciers. As snow at the surface gets buried with time it gets compressed to form solid ice and this ice carries with......

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Approximate Pages: 4 (250 words per double-spaced page)

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