20. He proposed that the continents were not stationary but actually moving or drifting away from one another. His primary sources of evidence include the tilt of the continents, the locations of fossil fuels, the glacial till deposits and the shift of climates over time. These principles are considered and accepted in 1970 after all the principles on magnetic shifts, convection currents and sea floor spreading were integrated in the so called Plate Tectonic Theory.​