This is an excellent video, by MinuteEarth, to show your Earth Science students how deltas from due to river deposition.  It discusses how the river at its mouth will either create a delta or erode more of the land.  The science video will talk about how during ice ages, ocean levels drop and rivers then cut deeper into the land.  During part of the video, there is a quick discussion about how civilizations formed around the fertile land of deltas.

Here is a plate tectonic demonstration/lab idea for all grade levels.  You can easily use this video when teaching about earthquakes and plate movements.  All you will need is a hot plate, pan, some milk and chocolate powder.  Place the pan on the hot plate, pour in some milk, pour a thick layer of chocolate powder on top of the milk until the milk is covered.  Turn on the hot plate and then wait a few minutes up to about 5 and you should start to see the "crust" break apart and "magma" rise to the surface.  Extension in your conversation can be:

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:

This video by the Amoeba Sisters does a great job describing what a dichotomous key is and how it is used to classify and organize organisms. 

In this science video, Veritasium does a fantastic job interviewing the public to see if they know what it actually means to be a solid, liquid or a gas.  It is fun to watch people try to remember from their schooling what the scientific answer is.  This would be a great video to show when introducing 3 of the 4 states of matter to your chemistry or physical science students.

I show this video during my unit on volcanoes when discussing the two Hawaiian volcano flow types, Pahoehoe and aa lavas.  It shows both very well and I have the students shout out what type as the video plays.  There is also a great view as to what a shield volcano looks like so I pause it at that point to discuss why a shield volcano takes on the shape that it does.  I also talk about the cooling of the lava and how it hardens and turns into solid basalt.

I show this video during my unit on volcanoes when discussing the two Hawaiian volcano flow types, Pahoehoe and aa lavas.  It shows both very well and I have the students shout out what type as the video plays.  There is also a great view as to what a shield volcano looks like so I pause it at that point to discuss why a shield volcano takes on the shape that it does.  I also talk about the cooling of the lava and how it hardens and turns into solid basalt.

In this volcano video, students will be able to see a climb up Krakatoa's child, Anak.  I find this video fascinating because it vividly shows the results of recent volcanic activity.  Your students will be able to witness what fine ash looks like and how fragments are ejected from the volcano. 

This is a short video that does a good job describing the Yellowstone Supervolcano. It does a great job showing the potential of large magma chambers.  This volcano video will also talk about how much ash can fall in some places after very large eruptions.

I show this video when discussing the different types of volcanic eruptions.  This volcanic eruption style is a Hawaiian style.  The lava does a great job demonstrating Pahoehoe and Aa lava types.