a relatively hard, naturally formed mineral or petrified matter; a naturally forming aggregate of mineral matter constituting a significant pat of the earth's crust - BACK>>
An aggregate of one or more MINERALS rather large in area The three classes of rocks are the following: (1) Igneous rock - crystalline rocks formed from molten material Examples are granite and basalt (2) Sedimentary rock - A rock resulting from the consolidatrion of loose SEDIMENT that has accumulated in layers Examples are sandstone, shale and limestone (3) Metamorphic rock - Rock that has formed from preexisting rock as a result of heat or pressure
also known as stones, curling rocks are made of rare, dense, and polished granite quarried only on Ailsa Craig, an island off Scotland's coast Each rock weighs 42 pounds