Plate Tectonics

Plate Tectonics

The theory of tectonic plates states that the Earth surface is made of rigid slabs of rock, or plates, that move with respect to each other
1. Alfred Wegeneer
  1. First proposed the Continental drift hypothesis in 1915
  2. Al though he had evidence to prove his hypothesis, he wasn't able to explain how they move
  3. He published "The Origin of the Continents and Ocean" in 1912
2. Continental drift
  1. Super continent called Pangea began breaking apart about 200 million years ago
  2. Continental drift the hypothesis suggest that the continents are in constant motion in the surface Earth
  3. Continents drifted to present positions and they also broke through the Ocean crust
3. Seafloor Spreading
  1. Is the theory that oceanic crust forms along submarine mountain zones, known as the mid-ocean ridge system, and spreads out laterally away from them.
  2. The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in 1960.
  3. Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other.
  4. help from: https://www.britannica.com/science/volcanism and from:: https://www.nationalgeographic.org/encyclopedia/seafloor-spreading/
Harry Hess
1. He published "The History of Ocean Basins" in 1962
2. He created a theory that could explain how the continents could actually drift. This theory later became known as ‘Sea Floor Spreading'. Hess believed that ocean trenches were the locations where ocean floor was destroyed and recycled.
3. Although his theory made sense, Hess knew, like Wegener, that he still needed convincing geophysical evidence to support it. This was to come just a year after his 1962 publication.
4. Help form: https://www.geolsoc.org.uk/Plate-Tectonics/Chap1-Pioneers-of-Plate-Tectonics/Harry-Hess

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