Yes. If you get it hot enough without burning it (such as boiling it in water to a very high temperature), it will turn to liquid.
If kept frozen.
Yes, it is possible, but only at extremely high pressures and temperatures, in an inert atmosphere.
Do you mean WHY DOES TOAST TOAST? Because it's heated and turns brown.
yes, usually only broken ones get to the point of being that hot though
Yes, it is possible to melt certain types of rocks, as they are made up of minerals that have melting points. Burning a rock is more difficult as rocks are composed of minerals that are typically more resistant to combustion. However, under extreme conditions, it is possible to burn some types of rocks through a process called pyrolysis, which breaks down the minerals into simpler compounds.
Antarctica is a continent: continents do not melt.
You would melt your toaster. Magnesium burns with a white flame when heated in air.
I consider that is not possible.
the sugar will melt
it is probably possible but it has never happened!
No. Human tissue will burn rather than melt and will not form rock.
No, it is not safe or practical to melt glass at home without proper equipment and training.
It is possible to melt metals including copper. It requires a very high level of heat, depending on the metal.ADDED@ Not sure why that "and copper". Copper IS a metal.
If kept frozen.
Very probable is possible.
Gobstoppers Stick 'em in a microwave and they melt from the inside out. Although the outside tends not to melt and they become quite explosive, so don't actually do it.
With the grill just make cheese on toast then add another slice on top. Or 2 slices of cheese on toast, then put them together with ham in the middle. For cheese on toast, place the bread under the grill until toasted, then add the cheese until melted. Ultimate lazy toasty: If you have a toaster and a microwave you could make 2 slices of toast, slice some cheese, make a 'toast sandwich' with the cheese and ham then put it in the microwave to melt the cheese.