The (a)   main types of rocks are igneous, sedimentary, and metamorphic, each formed through distinct geological processes: Igneous rocks solidify from molten magma or lava that cools, creating textures like granite; sedimentary rocks form from layers of sediment, like sand or shells, that compact and cement together, resulting in formations like sandstone.

The three main types of rocks are igneous, sedimentary, and metamorphic, each formed through distinct geological processes: Igneous rocks solidify from molten magma or (a)   that cools, creating textures like granite; sedimentary rocks form from layers of sediment, like sand or shells, that compact and cement together, resulting in formations like sandstone;