The rock cycle is a continuous process that describes how rocks change from one type to another over time. It involves three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from cooled magma or lava, while sedimentary rocks develop from the accumulation of sediments. Metamorphic rocks arise when existing rocks undergo changes due to heat and pressure. The cycle begins when rocks are broken down into sediments through weathering and erosion. These sediments can then compact and cement to form sedimentary rocks. Over time, these rocks may be buried and transformed into metamorphic rocks, or they can melt into magma, restarting the cycle.