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A large iceberg with ridged blue-white ice floating in open ocean water.
Environment

Are icebergs made from frozen seawater?

Published

Verdict
False
Verification confidenceHigh

Explanation

No. Icebergs are pieces of glacial ice that have broken away into water. Floating in the ocean does not mean they formed from frozen seawater.

The Canadian Coast Guard describes icebergs as freshwater ice originally formed on land. The National Snow and Ice Data Center explains that glaciers and icebergs originate from snow falling on land.

Sea ice has a different origin: it forms when ocean water freezes. Both can occur in the same polar waters, so their location alone does not distinguish them.

Key takeaway

Icebergs and sea ice have different origins: glacial ice comes from land, while sea ice forms from ocean water.

Evidence

Icebergs originate as freshwater ice on land

Canadian Coast Guard

Contradicts the claim

Section 3.3.1 describes icebergs as freshwater ice originally on land that breaks away from glaciers into the sea.

Based on: Canadian Coast Guard

Glacial ice and sea ice form differently

National Snow and Ice Data Center

Contradicts the claim

The explanation distinguishes icebergs and glaciers formed from snowfall on land from sea ice formed in ocean water.

Based on: National Snow and Ice Data Center

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