TECTONIC ACTIVITY
AQA Geography, paper 1.
- Created by: Georgia Barnaby
- Created on: 29-04-14 18:23
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- TECTONIC ACTIVITY
- Structure of the Earth
- The Earth's crust is divided into 12-13 plates, which move at around 3-5cm per year.
- Continental plates are older, less dense and can't sink.
- Oceanic plates are younger, more dense and sink. Can be renewed and destroyed.
- Plate movement occurs at two types of margin: tensional and compressional
- Tensional: constructive (divergent) margin and conservative margin
- Compressional: destructive margin and collision margin
- The Earth's crust is divided into 12-13 plates, which move at around 3-5cm per year.
- Earthquakes
- An earthquake is the movement of the earth, caused by the sudden release of pressure that has built up between plates.
- Earthquakes occur along all plate boundaries, but if they occur at a subduction zone it's called a BENIOFF ZONE.
- The origin of the earthquake is the FOCUS, and is usually deep underground. Earthquakes closer to the surface usually cause more damage.
- Structure of the Earth
- CONSTRUCTIVE: volcanoes, lava plateau, earthquakes
- DESTRUCTIVE: subduction zone, volcanoes, fold mountains, earthquakes
- CONSERVATIVE: earthquakes, faults
- COLLISION: fold mountains, earthquakes
- TILTMETERS identify changes in the landscape, SEISMOMETERS measure earthquake waves.
- PREDICTION: trying to forecast when an earthquake will happen
- PROTECTION: building to withstand earthquakes
- PREPARATION: hospitals, drills, ect...
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