A fun way to learn the 3 rock types, ... Metamorphic Rock Type. Metamorphic rocks form from a previously existing rock, be it igneous, sedimentary or even an older metamorphic rock.

3. Metamorphic rocks. Metamorphic rocks are formed when another rock is under heat and pressure. Marble is a metamorphic rock, it is highly decorative and used for statues. 1 of 3.

Rock Types: Igneous, Sedimentary, and Metamorphic Rocks Explained. Posted: March 12, 2025 | Last updated: March 12, 2025. This 1930s educational film explores the natural landscapes, geological ...

In a recent study, geologists say Michigan is home to the oldest known rock in the nation. Watersmeet gneiss is found in Michigan's Upper Peninsula. Minnesota's Morton gneiss previously held the ...

Metamorphic rocks — which have been heated, put under pressure, or both — can grow stronger (harder to break) and heavier. Metamorphic rocks are one of the three main rock types; the other two ...