New rock material is sometimes brought up from the mantle in magmas, but most surface rocks are made from ingredients that are continually recycled as rocks are made and remade. The ingredients can be large outcrops of rock, or small chunks, grams or even atoms, and geologists call the recyclmg process the rock cycle. There are many paths through the cycle. Igneous rock formed by the freezing of molten magma, for instance, might be broken up by the weather into fragments that are washed in rivers into the sea. There fragments pile up on the sea bed and eventually turn to sedimentary stone. This sedimentary rock may, in turn, be buried and squeezed or heated to form metamorphic rock. This too can be broken down and made into sedimentary rock.