Plate Tectonics Current Theory. Plate Tectonics  Theory that explains how large pieces of the lithosphere (Plates) move and change shape (Holt 247).

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Presentation transcript:

Plate Tectonics Current Theory

Plate Tectonics  Theory that explains how large pieces of the lithosphere (Plates) move and change shape (Holt 247).  Driving force is convection current in the mantle

Evidences

Mid-Ocean Ridges  Long undersea mountain chain with narrow valleys and step sides.  Form by “…magma rises from the asthenosphere, and that creates new oceanic lithosphere as tectonic plates move apart” (Holt 242).  Found most earthquakes happened at these ridges

Seafloor Spreading Harry Hess and Robert Dietz (1960s)  Crust separates at mid-ocean ridges  New seafloor forms from upwelling of magma into cracks  Seafloor spreads as new magma is brought out

Seafloor Spreading Continues J. Tuzo Wilson (1965)  Canadian geologist  Described his idea as rigid “plates,” three boundary types pricellaea52.edublogs.org

Paleomagnetism  The recording of the magnetic field in ancient rocks that gives the direction and intensity of Earth’s magnetic poles at the time the rocks formed.  Provided evidence for seafloor spreading  Pattern was symmetric around the ocean ridges

Geological  Earthquakes and volcanoes  Most are found along plate boundaries  centeqsww/ centeqsww/  phtml phtml  centeqsus/Maps/US2/ php centeqsus/Maps/US2/ php

Fossils