33. How to Identify Rocks

How can you tell what type of rock you have? Join us to learn how you can tell one type of rock from another. The layered rock in the thumbnail image on the far left is called Vernon wonderstone. It comes from a quarry in Utah and is technically a "welded-vitric tuff," a type of volcanic rock. The colorful banding is caused by groundwater with iron oxides that altered the tuff. It's one of my favorite rocks and I…