Where do stones come from and how are they formed?

Stones are formed through a process called lithification, where sediment or molten rock hardens over time. Sedimentary rocks are formed from layers of sediment compacting and cementing together, while igneous rocks are formed from molten rock cooling and solidifying. Metamorphic rocks are formed from existing rocks being subjected to high pressure and temperature, causing them to change. Overall, stones are created through the Earth's natural processes over millions of years.