Igneous rocks form when molten rock, or magma, cools and hardens. Sedimentary rocks result from erosion of any rock type, followed by depositing the resulting sediment into a natural basin, and finally cementing the sediment into stone. Metamorphic rocks form when any rock is subjected to great heat and pressure, but not enough heat to melt the rock. This site is a great starting point for kids of all ages who collect rocks, minerals and fossils. The rock cycle is a group of changes.
Igneous rock can change into sedimentary or metamorphic rocks.
Sedimentary rocks can change into metamorphic or igneous rock. Metamorphic rock can also change into the other kinds of rock. This information is meant to help collectors remain conscious of some of the dangers associated with rock hunting. Take a Virtual Rockhound Trip. Go to Earthprints Interactive Photo Gallery .