Afurnace is used to heat water air a refrigerant radiant coils

The answer is water. The heat from the furnace heats up the water and hence the hot water move along the radiant coils and distributes/move this heat to the target site. The steam can be used to warm up a house or move a steam engine, etcetera

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.

their crystal patterns have been disrupted by stress