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.
Characteristics of rocks. Some rocks are harder than others. For example, granite is a very hard rock, but chalk is a very soft rock and wears away easily. Some rocks, such as sandstone or chalk, let water soak through them.They are called permeable rocks.haracteristics of rocks. Some rocks are harder than others. For example, granite is a very hard rock, but chalk is a very soft rock and wears away easily. Some rocks, such as sandstone or chalk, let water soak through them. They are called permeable rocks.