This is a great video to introduce prefixes and suffixes to primary students.

This is an animated video discussing the age of the earth.  It discusses uranium and zirconium dating methods.  Part of the video also talks about how geologists use relative age dating.
 

This is a great video that can be used to introduce or review the main ideas and supporting details in a story or paragraph.

This TEDed video shows just how big the ocean is.  It does a great job at putting the sheer size of the ocean into perspective.

This animated video describes the formation of minerals particularly the mineral quartz and how that quartz becomes sand.  The video will discuss the concepts of mineral formation, sand dune formation, river deposition, and erosion.

In this video you will actually get a chance to see how old your ears are.  This video does an excellent job explaining the science behind it as well as actually demonstrating this scientific concept to your students and yourself.  See how old your ears are.

This video does an excellent job explaining the answer to the question, "How small is an atom?  It compares an atom to the size of a grapefruit and a blueberry.  It is amazing to visualize just how small atoms really are.
 If you happen to be teaching about atomic structure, this might help your students understand this particular scientific concept.

For most of history, scientists weren't quite sure why our hearts were beating or even what purpose they served. Eventually, we realized that these thumping organs serve the vital task of pumping clean blood throughout the body. This video investigates how it all works by taking a closer look at the heart's highly efficient ventricle system.

In this demonstration, students will get a better understanding of what a geyser is and what makes it function the way it does.  I was worried about trying this at the high school earth science level because it is a bit elementary, but the science is sound, and it works.  Materials needed are:

In this video, students will witness the destructive power of an earthquake and learn about a fascinating phenomenon called liquefaction. This video was captured during the 2011 earthquake in Japan and shows how the earth shifts and grinds the dirt, squeezing the water out and causing the ground to become like quicksand. By watching this video, students will gain a better understanding of the impact earthquakes can have on the environment and how they can cause changes in the ground structure.