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Plate Tectonics Menu
Transcript of Plate Tectonics Menu
Thus at divergent boundaries,oceanic crust,made of basalt,is created. When two plates come together,it is know as a convergent plate boundary. The impact of the two colliding plates buckles the edge of one or both plates up into a rugged mountain range,and sometimes bends the other down into a deep sea floor trench.
Earthquakes are usually caused when rock underground suddenly breaks along a fault.This sudden release of energy causes p waves,s waves,and magnitude. P waves are a higher frequency than S waves The first kind of body wave is the P wave or primary wave. This is the fastest kind of seismic wave, and, consequently, the first to 'arrive' at a seismic station. The P wave can move through solid rock and fluids, like water or the liquid layers of the earth.
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other,which is known as subduction. Deep trenches are often formed where tectonic plates are being subducted and earthquakes are common.
A mid-ocean ridge is an underwater moutain range,formed by plate tectonics. This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary
Earthquakes occur along plate margins (where plates meet). When plates move past,towards or away from each other,the movement is not smooth. Friction causes the plates to get stuck. This causes pressure to build up.Earthquakes occur when this build up of pressure is released. The point where the earthquake starts is called the
. Seimsic waves which are an elastic wave in the earth that race rapidly from the point of focus. The point at ground level,directly above the focus is called the epicenter. Another part of an earthquake is the fault line which is caused by the action of plate tectonic forces,with the largest forming boundaries between the plates.
The two main types of waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the planet like ripples on water. Earthquakes radiate seismic energy as both body and surface waves.
The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph.