This NASA video demonstrates how scientists compare distances between the planets and the sun using the measurement system, Astronomical Units. They do a great job discussing scaling and why we use AU's as the measurement system when talking about our solar system.
A quick video that will describe erosion found in the mountains and show beautiful scenery, then you have found a good one. This video shows scenery from high up in the Oregon mountains and has excellent footage of erosion.
This is an introduction to population distributions. It talks about the three different population distributions: aggregated, uniform, and random. The video contains neat footage of animals and plants living in different locations of the world.
In this educational video, scientists from Arizona State University, discuss a little bit about the red planet, what we know about it, and how we go about studying it. Great introductory video for those studying Mars.
If you are teaching about how predators and prey interact then this video is awesome. It shows a monitor lizard and a cobra fight and defend themselves while trying to eat eggs. Great introductory video.
This scientific video from BBC is really neat. It shows a few different types of fish that use luminescence to attract prey and obtain their food.
This is an interesting video that describes some problems with the aquatic food web that contains certain types of trout.
This video would be a great one to use if you are going to introduce the food web and predator/prey relationships. It has some great footage of animals chasing each other around.
This video explores why some people get allergies more often then others. What are allergies anyway? Did you know that people with good hygiene are more likely to form allergies or that having a pet as an infant might actually help you avoid getting allergies?
TEDEd created this video, which is an animation about how a cell is attacked by a virus. It is very detailed and uses language that is easy to understand. The video will go through many parts of the cell and demonstrates the processes of both the cell and the virus.