Question

When two pieces of ice are pressed together they form a single lump. This happens due to __________.

• A. liquefaction
• B. occlusion
• C. absorption
• D. regelation

Answer 1

The correct option is D regelation

Regelation is the phenomenon of melting under pressure and freezing again when the pressure is reduced. Thus when two pieces of ice are pressed together they form a single lump, regelation takes place.

When the two ice cubes are pressed together, the melting point of ice is lowered, so they melt to form a thin layer of water (between them). On releasing the pressure, the water formed freezes because the decrease in pressure raises the freezing point. Hence the two cubes stick together.

Hence, the correct option is $\text{D}$