A rock is defined as a solid material that forms part of the surface of the earth and other similar planets. A rock is usually exposed on the surface or underlying in the soil or oceans. It is also referred to as any natural material that is hard or soft and that has a distinctive mineral composition.
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what is the definition of a rock
a large mass of stone forming a hill, cliff, promontory, or the like.
stone in the mass: buildings that stand upon rock.
a stone of any size.
something resembling or suggesting a rock.
a firm foundation or support: The Lord is my rock.
Chiefly British a kind of hard candy, variously flavored.