What is the difference between sedimentary and metamorphic rocks?

Geologists categorize rocks into three basic groups, of which sedimentary and metamorphic are two. Igneous is the third. Sedimentary rocks are laid down in layers of sediments such as mud, silt and sand that accumulate and harden over time.

Igneous rocks are formed from the solidification of lava or magma. Metamorphic rocks are a bit of a combination. They are sedimentary rocks or igneous rocks that have been deformed and changed by high pressure and temperature deep in Earth, or by contact with, or close proximity to a magmatic intrusion A simple diagram showing the rock cycle with the processes that link sedimentary and metamorphic rocks as well as a simple diagram showing how metamorphic rocks are named and the rock types from which they are formed as well as A glossary of geological terms is also available.

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