Rocks are formed through a process called the rock cycle. The rock cycle starts with the cooling and solidification of molten rock, called magma which forms igneous rocks. Over time, these rocks can be weathered and eroded by wind, water, and other forces. The eroded particles can then be deposited and compacted to form sedimentary rocks. Under intense heat and pressure, these sedimentary rocks can undergo metamorphism, transforming into metamorphic rocks. This cycle can repeat over millions of years, with rocks constantly changing and being recycled. So, rocks are formed through a combination of geological processes like coolsing, weathering, erosion, deposition, and metamorphism. We made a model of the rock cycle on page 42 in our notebooks. It shows how all rocks start as sedimentary rocks and either melt into igneous rocks or turn into a metamorphic rock under heat and pressure. Bottom line, they always start and end as sediment.
