Question

if two ice cubes are pressed against each other they stick together firmly after some time because

Answer 1

When the ice cubes are pressed together, there is a generation of heat due to which the outer layer melts and the friction decreases. As the temperature of both the cubes is less the water refreezes.

Answer 2

At first , due to pressure the ice cubes START melting but when pressure is released they again freeze and stick to each other.