The three types of rock in the rock cycle are igneous, sedimentary, and metamorphic rocks. Igneous rocks form from the cooling and solidification of molten magma or lava. Sedimentary rocks develop from the accumulation of sediments and organic materials, often in layers. Metamorphic rocks arise from existing rocks transformed by heat, pressure, or chemically active fluids. This dynamic cycle illustrates the continuous transformation of Earth’s materials over geological time.