This map explains the various forms of tectonic activity such as hot spots, accretion, subduction, and spreading, and includes the locations of volcanoes and the earthquakes of 6.0 magnitude or greater which occurred from 1975-1985.The 1985 Earth's Dynamic Crust map features:??? Six inset maps showing the location of the continents from 540 million years ago to the present??? Insets illustrating a