Q:

How do plate tectonics work?

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Quick Answer

Each continent is embedded onto plates, which are made from lithospheres - Earth's outermost layer. Because this layer is stronger than the underlying layer, it is able to move. Several forces encourage it to do this, which means Earth's landmass remains the same, but the location of continents shifts slightly each year.

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Full Answer

The plate tectonics theory first developed in the 1960s and 1970s as a means of explaining why Earth's continents have moved throughout history. It states that the layer underpinning the continents, the lithosphere, is able to move. This occurs when the seafloor's motion creates drag, and when it generates a downward suction. Another theory is that the sun and the moon generate tidal forces that encourage it to move.

The movement from plate tectonics is fairly minimal, at a rate of 0 to 100mm per year. The lithospheres are made of seven primary areas, as well as some minor regions. Sometimes the plates are able to move past each other, but at other times they crash, giving rise to events like earthquakes. In addition, crashing plates can cause volcanic eruptions and the development of mountains. While it is not always dangerous to live on or near a plate boundary, some areas do experience more earthquakes as a result.

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Related Questions

  • Q:

    Can mountains grow?

    A:

    According to About.com, the Earth creates mountains through plate tectonics, where its crust is broken into plates constantly in motion, causing stress and uplifting in order to grow mountains. While growth is slow due to these forces, it does happen.

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  • Q:

    Why do earthquakes happen?

    A:

    Earthquakes are the result of two of the Earth's crustal plates slipping past each other, otherwise known as plate tectonics. The vibrations caused by this sudden movement reverberate through the surrounding rock structures, and they are felt as tremors. Earthquakes are most common among the geologically active regions at the borders between plates of the Earth's crust, also known as fault zones.

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  • Q:

    Who discovered plate tectonics?

    A:

    Researcher Alfred Wegener developed the continental drift theory that led to the modern theory of plate tectonics. Because plate tectonics is still a theory, it is hypothesized and not officially discovered or proven.

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  • Q:

    Why do plates move?

    A:

    Plates move because of gravity, which is the main driving force behind plate tectonics. Another reason why plates move is due to convection.

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