Tectonic plate, a large piece of Earth's crust that moves slowly., Plate boundary, where two tectonic plates meet., Divergent, plates move apart., Convergent, plates move towards each other., Transform, plates move past each other., Magma, hot molten rock beneath Earth's surface., Subduction, when one tectonic plate moves beneath another., Slab pull, sinking of a dense part of a plate that pulls the rest of the plate, Mid-ocean ridge, raised area where new oceanic crust forms., Deep-sea trench, deep feature formed at a subduction zone., Epicentre, the point on Earth's surface directly above where an earthquake originates., Focus, the location within Earth where an earthquake originates., Subduction zone, where one plate moves beneath another., Denser part, the part that sinks., Less dense part, the more buoyant part., Mantle, the layer beneath Earth's crust., Ridge, a raised area such as a mid-ocean ridge, Theory of plate tectonics, explains that Earth's crust is divided into large pieces., Continental drift, is the idea that Earth's continents have moved slowly over millions of years., Common features of a divergent boundary are, mid-ocean ridges; new crust., Common features of a convergent boundary are, subduction; deep-sea trenches., Common features of a transform boundary are, earthquakes.

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