The ice on Lake Peipus in Estonia sometimes forms this unusual, jagged surface. What’s it called?

The ice on Lake Peipus in Estonia sometimes forms this unusual, jagged surface. What’s it called?

A Hummock ice
B Ice shingles
C Dragon scales

Uneven temperatures and pressure under the sheet of ice on the lake surface can cause parts of the ice to jut up over the top, forming these shingle-like ridges known as hummock ice. No skating here, folks.

The correct answer is Hummock ice.

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