Earth's lithosphere is broken into major pieces called plates which move on the surface in a process called Plate Tectonics.
How has the Earth's surface changed throughout its history? What caused these changes to occur?
Geologists have learned about the structure of Earth by studying seismic waves of earthquakes and volcanoes.
Alfred Wegener theorized that all the continents were joined together and since drifted apart. This theory was called the Theory of Continental Drift.
Discovery of the sea-floor spreading had scientists look again at the Theory of Continental Drift.
What is Earth's internal structure?
What is the composition of Earth's interior?
How have geologists learned about Earth's inner structure?
What was Alfred Wegener's hypothesis about the continents?
What evidence exists to support Wegener's theory of continental drift?
Why was his theory rejected?
What is the process of Sea-Floor-Spreading?
What is the evidence that supports this?
Asthenosphere, Lithosphere, Mantle, Core, Crust, Mohorovic Discontinuity, inner core, outer core, geosphere
Continental drift, Pangaea, Fossils
Mid-ocean Ridge, Sea-Floor-Spreading, Deep Ocean Trenches, Subduction zone, Paleomagnetism, Normal polarity, Reverse polarity, Rift valley
Theory of Plate Tectonics is supported by the evidence collected by Wegener and other scientists explaining how Earth's surface has changed throughout history.
What evidence supports the theory of plate tectonics?
How does paleomanetism support the theory of plate tectonics?
What causes plate motion?
What are the three types of plate boundaries and what occurs at each one?
continental volcanic arc, volcanic island arc, hot spot, convection current, Plates, Plate Tectonics, Divergent boundary, Convergent boundary, Transform faulty boundary, Convection currents
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