5th

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.

Discusses how scientists go through the Scientific Method and Processes to experiment ideas, thoughts, notions and observations.   Great video.
 

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. 
 

Experience a side-splitting video parody that imagines a calamitous weather forecast. Prepare to be entertained as students witness what happens when everything goes hilariously wrong. Suitable for students of all ages and adaptable to various settings, this video guarantees a memorable learning experience. After the laughter subsides, continue the educational journey by exploring the wealth of additional resources, including videos, worksheets, and labs, available at EducationalResource.org.

Have you ever wondered whether or not ketchup was considered a liquid or a solid.  After all it can take a lot to get ketchup out of a bottle.  Sometimes you have to shake and squeeze really hard and then it all come squirting out.  Well in this TEDEd video they will explore the science behind ketchup and other similar substances' viscosity.
 

Watch as a whole line of cars falls off into a ravine in this amazing amateur video.  This would be a great video to show during a unit on erosion, deposition, and landslides.

Here is a catchy song for young students that discusses the 8 planets.  
 

This is a great video to share in with your students.  The video explores some scientific evidence that plants can learn and can remember.  But how?  They don't have brains.  This video demonstrates some pretty unique and awesome behaviors of the plant kingdom.

Have you ever wondered why the moon sometimes seems to be much larger?  This video will explore illusion of moon sizes.

Check out some anatomy of whales.  This video demonstrates how whales communicate under water.  The video is of a real scientists who delves into the actual field of comparative anatomy.