Continental drift - movement of the plates of the Earth's crust in relation to each other, Convection current - circular movement that occurs when warmer, less dense fluid particles rise and cooler, denser fluid particles sink. , Epicentre - The point on the Earth's crust directly above the site where an earthquake originates. , Folding - Buckling of rocks caused by rocks under pressure from both sides. , Focus - The point at which an earthquake begins. , Fault - Break in a rock structure causing a sliding movement of the rocks along the break. , Plate tectonics - Theory concerning the movement of the continental plates., Richter Scale - a scale that measures the amount of energy released in an earthquake. , Seismograph - an instrument used to detect and measure the intensity of an earthquake, Seismologist  - a scientist who studies earthquakes. , Converging plates - two plates push against each other, forms volcanoes, earthquakes, huge mountain ranges. , Diverging plates - plates moving away from each other in opposite directions, forms ocean ridges, , Transverse plates - neighbouring plates slide past each other. Causes earthquakes. ,

Dynamic Earth Terms

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