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.
Rocks are made of one or more minerals. There are three main classifications of rock, based on the way the rock was formed: sedimentary, metamorphic and igneous. Soil is formed of fine rock particles mixed with air, water and particles from dead plant and animal matter.There are three main types of soil which are classified according to the amount of sand and clay in them.ther rocks are made from two or more minerals â for example, granite is made from feldspar, mica and quartz. Common minerals that form rocks include: feldspars, mica, quartz, calcite, dolomite, amphiboles, pyroxene and olivine. Rocks are used for a range of purposes depending on their properties.