题目内容

Glaciers form in areas where more snow falls in the winter than is lost in the summer.

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A glacier will take hundreds of thousands of years to form, but only a few thousand years to disappear.

Sea ice is composed of frozen saltwater.

The iceberg that sank the Titanic came from a glacier in Greenland.

The only continental ice sheets left on Earth today are in Greenland and Antarctica.

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