Plate Tectonics for 5th grade
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Continental Drift Hypothesis
Earthquakes
Earthquake Waves through Earth
Layers of the Earth
Mechanisms of Plate Motion
Plate Interactions
Volcanoes
Mountains
Mid-Ocean Ridges and Rift Valleys
Intraplate Volcanoes
Biblography
During the twentieth century, studies of the paths of P and S waves through Earth helped scientists identify the boundaries of Earth's layers and determine that the outer core is liquid.