In my project, the red represents the Magma. The Magma would work it's way up through the earths crust and up to the Volcano. Also, by doing that, it moves the earth's plates. Seafloor spreading is one of the causes of plate tectonics. Also, I had to explain why the oldest continental crust is 4byo while sea flooring is only 2myo. think that oceanic crust breaks over and then makes another crust. Another reason why sea flooring is younger is because when sea floor is old, it makes another one. The blue represents the crust going over the old one. The brown represents the Volcano.