A combination of increased temperature, a decrease in confining pressure or addition of volatiles can all act to cause rock to melt.
Yes, a rock can change. It's not as easy to change a rock as it is to change a marshmallow, but it can be done.
It would first change from a solid to a liquid.
lava cooling to become rock is a change of state from liquid to solid
Melting the rock to its liquid form then re-freezing it into a solid will realign the rock's crystaline structure thereby altering the density.
change of a liquid to a solid
The change from liquid to solid is called freezing.
Sure, change from solid to liquid is a physical change
when ice was solid change liquid because sun was very hot. ice will change liquid change back solid again
The Lithosphere is solid rock floating on molten rock.
change of a liquid to a solid
Freezing is the change in state from liquid to solid.
The change in state from a solid to a liquid is called melting.