The Restless Earth-Glossary 0.0 / 5 ? GeographyThe Restless EarthGCSEAQA Created by: JordssCreated on: 16-04-14 22:01 Constructive margin Two plates are moving apart from one another 1 of 28 Continental Crust Thicker and less dense crust 2 of 28 Oceanic Crust Thinner and more dense 3 of 28 Destructive margin Two plates are moving toward each other 4 of 28 Subduction The sinking of oceanic crust at a destructive margin 5 of 28 Mantle Dense, mostly solid and the layer between the outer core and the crust 6 of 28 Convection currents The circular currents of heat within the mantle 7 of 28 Conservative margin Two plates are moving past each other 8 of 28 Fold mountains Large mountains where rock layers have been pushed and folded together 9 of 28 Ocean trench A deep section in the ocean, usually where an oceanic plate is sinking underneath a continental plate 10 of 28 Composite volcano A steep sided volcano made of ash and lava 11 of 28 Shield volcano A broad volcano that's mostly made up of lava 12 of 28 Subsistence Farming to produce food and other resources for farmers and their family 13 of 28 Terraces Steps created in the hillside to create area of flat land 14 of 28 Irrigation Artificial watering of the land 15 of 28 Natural hazard Occurrences where people have little control where a threat occurs on people's lives and possessions 16 of 28 Caldera The depression of a supervolcano from a collapsed magma chamber 17 of 28 Fissures Openings along a line of weaknesses that allow magma to escape 18 of 28 Geothermal Water that is heated below the ground which comes to the surface in different ways 19 of 28 Geyser Geothermal feature where water erupts into the air because of pressure 20 of 28 Hot spot Section of an earths crust where magma rises weakening the crust. These are away from the plate boundaries 21 of 28 Focus The part IN the earths crust where the earthquake originates from 22 of 28 Richter scale Logarithmic scale based on scientific recordings and the amount of movement 23 of 28 Epicentre The point directly above the focus on the earths crust 24 of 28 Shockwaves Seismic waves generated by an earthquake that passes through the earths crust 25 of 28 Mercalli scale Measuring an earthquake by describing and comparing the damage done on a scale from 1 to 12 26 of 28 The three P's Prediction Preparation Protection 27 of 28 Tsunami A wave that is often created because of an earthquake where the entire depth of ocean/sea is in motion from above the earthquake 28 of 28
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