Science: How is copper mined, refined, and used by humans?

This is a pretty neat video that discusses how copper is formed and then goes on to demonstrate how we take it out of the ground refine it, and then tells shows us what how we use it.  It looks to be a composite of many different videos.

Subject:  Earth Science
Grade Level:  6-12
Length:  13:55

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