Plate Tectonics By: Noah Slaten

The plate tectonics theory is a process that proposes that earths outer shell consists of individual plates that interact in various ways.

Continental drift is a hypotheses originally proposed that the continents had once been joined together to form a super continent called Pangaea. When plate tectonics is a theory that proposes that earths outer shell consists of individual plates that interact in various ways.

Picture of ocean Drilling site
This diagram shows plate tectonics processes that have been active at one time or another in Oregon's geologic history. Today’s plate tectonics look very much like the right half of the diagram, with the active Cascadia Subduction Zone off the Oregon coast, an active volcanic arc in the Cascade Range, and a rift zone forming in eastern Oregon. Tens of million years from now, as Oregon continues to change, the picture will look very different.

The theory of plate tectonics is proved with evidence. Earthquake patterns were used to prove the plate tectonic theory, scientist found a close link between deep focus earthquakes and ocean trenches. Also, the absence of deep-focus earthquakes along the oceanic ridge system was shown to be consistent with the knew theory. Some of the most convincing evidence confirming the plate tectonics theory is drilling right into ocean floor sediment. When the oldest sediment from each sediment was plotted against its distance from the ridge crest, it was reveled that the age of the sediment increased with increasing distance from the ridge. Mapping of seafloor volcanoes in the pacific revealed a chain of volcanic structures extending from the Hawaiian islands to Midway Island and then north to the Aleutian trench. Another piece of evidence that proves the plate tectonics is Paleomagnetism, The discovery of strips of altering polarity, which lie as mirror images across the ocean ridges, is among the strongest evidence of seafloor spreading.


Created with images by tpsdave - "river glacier national park montana"

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