Evan is back with another impressive water experiment that you can try at home to learn about water salinity and density.
Fresh water is less dense than salt water, so it can sit on top. In undistributed waters, they can remain as separate bodies for a long time! This is referred to as a salt wedge. Did you know there is a pretty amazing salt wedge in the swan river? The wedge of salt water can move up to 55km upstream of the Swan River.