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What is the Theory of Plate Tectonics?
The Theory of Plate Tectonics is a relatively new theory with its beginnings in the early 1900s. It states that the Earth is composed of rigid lithospheric plates that are moving in relation to one another on the asthenosphere. The theory explains the locations of earthquakes and volcanoes. It explains mountain building and rock deformation on the continents, and even, in fact, describes the shapes and locations of the continents. It also helps us understand the youthful age of the sea floor and the unusual distribution of fossil and living organisms on the continents. In this portion of the unit, you are going to learn more about the Theory of Plate Tectonics as an explanation for how the Earth changes over time.
PART 1: Continental Drift - Birth of a Theory
PART 2: Seafloor Spreading - Bridging the Gap
