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.
Answers to Chapter 2 Review Questions 1. To be considered a mineral, a substance must exhibit the following characteristics: (1) be naturally occurring, (2) be a solid, (3) have an orderly crystalline structure, (4) have a definite chemical composition, and (5) generally be inorganic. 2.