Science: How do you tell which rock type you have. In your hands?

This guy does an excellent job using actual rock specimens to give you a simple way to identify the three types of rock. Metamorphic, sedimentary and igneous. Even though there are always exceptions to rules in science, you will find out some characteristics of each rock type that will give you an idea of what type of rock you are looking at.

Grade level: 6-12
Subject: Geology
Length:  3:09