Earth
- Created by: ukgamer321
- Created on: 06-05-14 16:47
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- Earth
- Crust- very thin outer layer
- Plate Tectonics
- plate boundary- place where plates meet
- Constructive
- plates move apart
- magma comes up and fills the gap causing volcanoes
- magma can escape easily so it does not erupt with much force
- Earthquakes are found and islands are made
- destructive
- continental and oceanic (more denser) plate meet.
- oceanic plate sinks below the other and melts into hot liquid rock (magma)
- volcanoes may erupt with lots of force, earthquakes will occur
- Conservative
- two plates slide past each other along a fault (weakness)
- earthquakes occur
- Constructive
- The surface is made up of plates that are moving very slowly, because of the convection currents in the mantle
- plate boundary- place where plates meet
- Volcanoes
- active volcano- erupted recently and is likely to erupt again
- Dormant- has not erupted for many years
- Extinct- not erupted for thousands or millions of years
- Cross section of volcano
- Ash volcano- formed from ash, steeped sided with large crater
- Lava volcano- thick slow-flowing lava that hardens quickly forms steep sides .
- Lava volcano- runny faster flowing lave moves and spreads over a larger area, forms gently sloping sides
- opening or vent in earth's surface
- Why people live in volcanic areas
- fertile soil for farming
- geothermal energy can be produced
- tourist attraction
- Volcanic Bombs- lumps of molten rock that solidify they fall
- Predicition-
- small earthquakes
- smell
- water level and temperature increase
- volcano shape change
- Earthquakes
- happen along plate boundries
- plates move past eachother
- they become locked
- friction causes pressure to build up. Suddenly pressure is released and they jolt into position. This cause vibrations
- they become locked
- focus- point of which the rock moves
- seismic waves start at focus
- epicenter directly above focus on earth's surface
- measured using richtor scale measures the magnitude of tremor. Size 6 is 10 times larger than 5 etc
- predict- animals act strangely, small tremors
- opening or vent in earth's surface
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