Plate Tectonics and structure of the earth
- Created by: blloob1
- Created on: 18-04-14 13:00
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- Plate Tectonics and structure of the earth
- Continental drift
- fosils had been found in the wrong places
- fossils of tropical plants found in the artic the climate would have killed them
- 300 milion years ago there was one supercontinent
- fosils had been found in the wrong places
- Structure of the earth
- The crust
- The crust is vary thin it varies between 5 and 50 Km
- Surounded by the atmosphere
- The Mantle
- The mantle has all the properties of a solid exept it can flow very slowly
- Within the mantle radioactive decay takes place
- This produces a lot of heat
- This causes the mantle to flow in convection currents
- This produces a lot of heat
- The core
- The core is made from iron and nickel
- The crust
- The earths surface
- The upper part of the mantle is cracked in to a number of large pieces
- These are called tectonic plates
- The plates drift because of convection currents in the mantle
- Most of the plates are moving at a few Cm a year relitive to each other
- Occasionally plates move very suddenly causing an earthquake
- Volcanoes and earthquakes often occur at the boundaries between two techtonic plates
- Techtonic can suddenly lurch forwards so it is impossible to predict exactly when they will move
- Scientists are trying ot find out if there are any clues that an earthquake might happern soon by looking at the strain on underground rocks
- Even with these clues they'll only be able to say where an earthquake is likely to happen not exactly when it will happen
- There are some clues to say when volcanic eruption might happen soon
- Moltern rock rises up into chambers near the surface causing the ground to bulge slightly
- This causes mini-earthquakes near the volcano
- Sometimes rock can cool down instead of erupting
- so mini-earthquakes can be a false alarm
- Sometimes rock can cool down instead of erupting
- This causes mini-earthquakes near the volcano
- Moltern rock rises up into chambers near the surface causing the ground to bulge slightly
- There are some clues to say when volcanic eruption might happen soon
- Even with these clues they'll only be able to say where an earthquake is likely to happen not exactly when it will happen
- Scientists are trying ot find out if there are any clues that an earthquake might happern soon by looking at the strain on underground rocks
- Techtonic can suddenly lurch forwards so it is impossible to predict exactly when they will move
- Volcanoes and earthquakes often occur at the boundaries between two techtonic plates
- Occasionally plates move very suddenly causing an earthquake
- Most of the plates are moving at a few Cm a year relitive to each other
- The plates drift because of convection currents in the mantle
- These are called tectonic plates
- The upper part of the mantle is cracked in to a number of large pieces
- Continental drift
- This landmass broke into smaler chuncks that moved apart
- 300 milion years ago there was one supercontinent
- Modern day continents are still drifing apart
- The core is the centre of the earth
- The core
- The core is made from iron and nickel
- The core
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