Metamorphic rock is formed when existing rock is transformed under high heat and pressure, which generally destroys any fossils that were in the rock before it was metamorphosed. For example, marble ...

For all its 'you've made it' cache, marble is just a chunk of garden-variety limestone that's had an extreme makeover. In geology-speak, it's the metamorphic version of limestone. The classiest ...

For example, the rock malachite is mostly made ... Metamorphic rocks are formed when another rock is under heat and pressure. Marble is a metamorphic rock, it is highly decorative and used for ...