8th

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. 
 

This video was created and sung on the show Happy Days.  The tune is catchy and is sung about the process the heart goes through as it pumps blood.  Circulatory System.
 

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.
 

This awesome video highlights two students who came up with a great invention for stopping ketchup from coming out all watery.  The video shows their invention and allows the students to explain the process in which they came up with a great invention.
 

Immerse yourself in a thought-provoking animated video that draws a captivating parallel between climate change and the timeless game of Tetris. Prepare to be intrigued as this enlightening presentation explores the striking similarities between the challenges of climate change and the experience of losing in Tetris. Gain a fresh perspective on the impact of greenhouse gases and how they intertwine with our changing climate. Brace yourself for a unique and engaging journey that combines gaming nostalgia with the pressing issue of climate change.

Prepare to be amazed and informed by this excellent animated video on the topic of tsunamis. Through the use of stunning visuals and easy-to-follow explanations, viewers will gain a comprehensive understanding of what tsunamis are, how they are formed, and the devastation they can cause. This video is an excellent resource for teachers and students alike, as it can be used to enhance lessons on tsunamis for a wide range of grade levels. After watching this video, viewers will come away with a deeper appreciation for the power of nature and the importance of being prepared.

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.