The Restless Earth 0.0 / 5 ? GeographyThe Restless EarthGCSEAQA Created by: TheA*StudentCreated on: 09-05-16 19:58 Crust Solid outer layer of the earth, 0-80km thick, made up of tectonic plates 1 of 24 Mantle Made of molten rock, flows like liquid 2 of 24 Outer core Liquid made of silicate, iron and nickel 3 of 24 Inner core Solid made up of iron and nickel, reaches 5500 degrees 4 of 24 Convection currents Movement in the mantle due to heating and cooler 5 of 24 Oceanic crust Denser, younger crust made of basalt that can be created/destroyed 6 of 24 Continental crust Less dense, older crust made of granite that cannot be created/destroyed 7 of 24 Destructive plate boundary When an oceanic and continental plate move towards each other 8 of 24 Constructive plate boundary When two plates move apart 9 of 24 Conservative plate boundary When two plates move alongside each other in the same or opposite direction 10 of 24 Collision zone/margin When two continental plates collide, forcing the land up 11 of 24 Fold mountains Mountains formed from the folding of the earth's crust at a collision zone 12 of 24 Shield volcano Volcano with wide base, gently sloping sides, and frequent non-violent eruptions composed of lava only 13 of 24 Composite volcano Volcano with narrow base, steep sloping sides and rare, violent eruptions composed of layers of lava and ash 14 of 24 Supervolcano Volcano much larger than a regular volcano with a deep caldera 15 of 24 Earthquake Sudden shaking of the crust as a result of friction between two tectonic plates being released 16 of 24 Focus Point at which the shock waves of an earthquake originate from 17 of 24 Epicentre Point directly above the focus on the earth's surface 18 of 24 Aftershocks Smaller earthquakes following the main one as the plates settle into place 19 of 24 Seismometers Machine used to measure earthquakes 20 of 24 Richter scale Scale to express the magnitude of an earthquake 21 of 24 Mercalli scale Less widely used scale to describe the strength of an earthquake 22 of 24 Mid-plate earthquake Earthquake that occurs away from a plate boundary 23 of 24 Tsunami A wave caused by an undersea earthquake in which the entire depth of the ocean is set into motion 24 of 24
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