Sandstone; coal; brick; cement block; conglomerate; glass block which is a rock, why are they rocks? 3
Sandstone conglomerateNatural extraction without construction
Rock is a natural mineral aggregate.So bricks, cement blocks, glass blocks are not rocks
Rock is a natural mineral assemblage of the earth's crust, in which the sandstone, coal and conglomerate are rocks. Bricks, cement blocks, glass blocks are not natural.
