Plate Tectonics

By Bailey Gregorski

Layers of the Earth

If you didn't know, the Earth has layers. The most important layers are the core, mantle, and crust. The core is important because it's the reason why we have a Magnetic field. The Mantle is important because it's the reason why tectonic plates move (convection), Last but not least the crust. The crust is important because it's the reason why we live. The crust are the huge plates that are always in motion.

Continental Drift

Continental Drift is the movement of continents resulting from the motion of Tectonic plates. Alfred Wegner published a book surrounding around the hypothesis of continental drift. All of continents looked as if they could be put together like a puzzle (Pangea). They also found fossils of the same genetic material on two different continents. That means that they were somehow related.

Sea-floor Spreading

Sea-floor Spreading is a rift in underwater mountain range where new oceanic crust forms. Once scientists found out about sea-floor spreading, they started to believe the theory of continental drift. Sea-floor spreading helped scientists see that that the ocean floor wasn't still, it was moving too.
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Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. Convection helps with the theory of plate movement by making the hot magma from the mantle rise in the cracks in the crust moving the plates slowly.
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Plate tectonic boundaries

Convergent- Tectonic plates colliding into one another.

Divergent- Tectonic plates moving apart from one another.

Transform- Two tectonic plates sliding past each other.

Convergent with Subduction- When one or both of the tectonic plates is composed of oceanic crust. The denser plate, made of oceanic crust, is sub ducted underneath the less dense plate, which can be either continental or oceanic crust.

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The Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. It is associated with plate movements .