central heating - a heating system in which air or water is heated at a central furnace and sent through the building via vents or pipes and radiators
exists and is an alternate of . Five physical characteristics of a mineral are: hardness, luster, diaphaneity, colour, and streak.
a rock is a naturally occurring solid it is made of minerals which are crystalline or other mineral like substances the minerals in the rocks vary making different kinds of rock see the fact file below for more information about rocks and mineralst is made of minerals which are crystalline or other mineral like substances the minerals in the rocks vary making different kinds of rock see the fact file below for more information about rocks and minerals