Earth Science: Why do Rivers have Deltas Video

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.