There are some exceptions, such as tree trunks surrounded by lava and preserved as casts, but these are rare. Metamorphic rock is formed when existing rock is transformed under high heat and pressure, ...

Heat and/or pressure will cause the elements in the original rock to react and re-form. Metamorphic rocks are highly resistant to erosion and are often used in building materials.

It's been a dream of mine for a long while to find Pudding Stones! Pudding stones are a type of sedimentary rock known as conglomerate. These Pudding Stones are conglomerates that have been ...

It depends on what the rocks are made of – and that’s related to how they were formed. There are three main rock types: igneous, sedimentary and metamorphic. These rocks are made of ...

The rocks on Barra formed in the Archaean Eon more than 2.7 billion years ago. “When we got close to the rocks in the quarry, we could see their banding was typical of Lewisian gneiss,” says Paul.