Earth

What are the broken-off pieces of glaciers that make it to the open sea called?

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Which of these rivers flows north?
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How much of an iceberg appears above the water line?
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John Glenn first orbited the earth in what year?
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If the beach loses 3 feet of sand each year, how many feet will it lose in 15 years?
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What event happened when water droplets were on a spider's web but it hadn't rained?
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On October 11, 1999 the world population hit a milestone of how many?
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Which age is known as the "Age of Fish"?
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What type of glaciers fill up the gaps between mountains?
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