1
Theory of plate movement where an upwelling of magma out of the asthenosphere cools and makes new crust while pushing older oceanic crust outwards.
2
Theory of plate movement that states that all of the continental plates were once one giant supercontinent but have drifted apart from each other over 250 million years to their current position.
3
Founder of continental drift
4
Movement of hotter and less dense magma upwards while cooler more dense magma sinks.
