Multiple choice

Why do two ice blocks join to form one block when pressed together?

  1. Melting point of ice is lowered with increase in pressure

  2. Melting point of ice increases with increase in pressure

  3. Melting point of ice remains unchanged with increase in pressure

  4. Melting point of ice is 0°C
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A Correct answer
Explanation

According to the regelation phenomenon, increased pressure lowers the melting point of ice. When two ice blocks are pressed together, the contact point experiences high pressure, causing local melting. Water formed lubricates the surface, and when pressure is released, it refreezes, joining the blocks.

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