Examples of igneous rocks. Granite; Basalt; Pumice; Gabbro; Metamorphic Rock Type. Metamorphic rocks form from a previously existing rock, be it igneous, sedimentary or even an older metamorphic rock.

Sedimentary rocks cover 75% of the Earth's surface. Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion)caused mainly by friction of waves, ...

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 ...

Examples of these rare rocks are slate, quartzite, schist, marble and gneiss. Our landscape is greatly influenced by the rocks making up our crust in York County.

Understanding geology is critical to studying paleontology because fossils are preserved in rock. The characteristics of the rocks that hold fossils can be as informative as the fossils themselves.

Was Mars once a land of lakes? And could those dried up lake beds harbor fossils of life-forms that possibly once lived there?