plate tectonic key terms 3.0 / 5 based on 1 rating ? GeographyPlate tectonicsA2/A-levelAQA Created by: aldomanCreated on: 16-12-13 10:29 subduction occurs when two tectonic plates collide and the denser plate drifts below the less dense plate 1 of 43 convection currents zones of hotter molten magma displaying circulatory motion in the asthenosphereto cause plate movement 2 of 43 8 major plates Eurasian,north american,south american,indo-austrailan,african,nazca,pacific ,antarctic 3 of 43 destructive margins when two plates collide reulting on subduction of the denswer plate beneath the less dense plate 4 of 43 constructive margins when two plates move in opposing direction to reveal a fault in the earths surface and possible ridt valley formation 5 of 43 rift valley the fracturing and rifting of the land as two land masses move apart.As the sides move the central region may fall down to form the rift. 6 of 43 conservative margins when two plates are moving parallel to each other,the resulting friction and energy build up may result in seimic activity 7 of 43 extrusive features igneous rock created by the crystalisation of magma above the earths surface 8 of 43 intrusive features igneous rock created by the crystalisation of magma beneath the earths surface 9 of 43 basaltic lava least viscous lava 10 of 43 andesitic lava silca lava commonly found at composite volcanoes 11 of 43 rhyoltic lava most viscous acidic lava forming steep sided volacnoes 12 of 43 dyke vertical intrusion with horizontal cooling cracks 13 of 43 sill horizontal intrusion with vertical cooling cracks 14 of 43 batholith a large intrusive feature formed of magma cooled below the earths surface 15 of 43 bedding planes sedimentary rocks which form the crust 16 of 43 fissure volacno occur along elongated cracks that allow lava to spill over a large area with a getle persistent eruption 17 of 43 shield volcano form getly sloping cone volcanoes of low viscousity lava and predictable eruptions 18 of 43 composite volcano most common land volanco formed of ash and lava layers displaying deructiive eruptuions with andesitic lava 19 of 43 acid/dome volacno steep sided volacno with destrucive natures that flow the most viscous rhyolitic lava 20 of 43 caldera exteremly destructive volcano characterised by a collapsed crater and andesitic lava. 21 of 43 boiling mud when hot water mixes with mud and surface deposists 22 of 43 solfatara created when gases mainly sulpherous escape onto the surface 23 of 43 geyser water in the lower crust is heated by rocks and turns to steam before exploding out onto the surface due to pressure increases 24 of 43 fumeroles super heated water turns to steam as its pressure drops when it emerges from the ground 25 of 43 active volcano erupted in living memory 26 of 43 dormant volcano erupted within historical records 27 of 43 extinct volacno will not eruput again 28 of 43 earthquake violent ground shaking for a period of time 29 of 43 focus the point below the earths surface where the earthquake originates 30 of 43 epicentre the point directly above the focus on to land surface. 31 of 43 shallow focus 0-70km 32 of 43 intermediate focus 70-300km 33 of 43 deep focus 300-700km 34 of 43 p waves primary waves that travel fastest and can travel through soilds and liquids 35 of 43 s-waves secondary waves that are mosre deustrucive than p waves but are slower,cannot pass through liquids and move in sideways motions 36 of 43 Surface waves slowest waves that travel near the earths surface and are most destrucive.the waves move both sideways ,backwars and fowards. 37 of 43 magnitude represents the amount of energy released from an erathquake 38 of 43 frequency represents how often an eartyhquake may occur 39 of 43 richter scale a measurement of earthquake magnitude.with 10x strength increase every unit. 40 of 43 Tsunami enourmous wave generated by a disturbance in the sea floor 41 of 43 liquefaction when ground is shaken so violently that it takes a liquid state 42 of 43 land slide slope failure due to ground shaking 43 of 43
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