nov 10, 1929 - Arthur Holmes discovered mantle convection currents. Holmes proposed the theory of convection currents in Earth. He observed when things heated they become less dense and rose, as they go up the cool and become more dense and sink. he believed this pressure could crack and move the continents. I used article 3.
Added to timeline:
Date:
nov 10, 1929
Now
~ 96 years ago