the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underlying the soil or oceans.
Groundwater will contain the minerals dissolved as the water moves through soil and rock materials.
a large piece of rock that has become detached from a cliff or mountain; a boulder.
the stream flowed through a jumble of rocks
used in similes and metaphors to refer to someone or something that is extremely strong, reliable, or hard.
imagining himself as the last rock of civilization being swept over by a wave of barbarism