June 26, 2011 Law of Superposition June 26, 2011/ Paul Andersen Mr. Andersen explains the law of superposition and the principle of original horizontality. He uses an animation to explain how rock layers can accumulate over time.Read More
June 26, 2011 Plate Tectonics June 26, 2011/ Paul Andersen Mr. Andersen describes how plate tectonics shapes our planet. Continental and oceanic platers are contrasted and major plate boundaries are discussed.Read More