plate margines and landforms
- Created by: michael-j-inman
- Created on: 14-01-14 11:28
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- plate margins
- destructive
- continental plate meets continental
- eg the indo austrailian plate and the euraisian plate colliding
- forms young fold mountains
- the collision buckles the two continental edges
- this crumples deep roote rocks and sedimentary rocks on the surface
- e.g. himilayers which due to the continued pressure are still growing in height made from folded sediments.
- this crumples deep roote rocks and sedimentary rocks on the surface
- the collision buckles the two continental edges
- forms young fold mountains
- eg the indo austrailian plate and the euraisian plate colliding
- oceanic meets oceanic
- e.g. pacific plate being sub ducted under the Philippine plate
- creates island archs
- pacific plate subducted beneathe phillipeane
- it partially melts
- magma rises through the gaps in the phillpiene plate forms submarine volcainoes
- builds up a cresent shape of volcainoes
- continued volcanic activity builds up sea mounts into islands forming an island arch
- builds up a cresent shape of volcainoes
- magma rises through the gaps in the phillpiene plate forms submarine volcainoes
- it partially melts
- pacific plate subducted beneathe phillipeane
- oceianic meets continental
- landforms
- deep sea trenches
- long narrow v shaped sea depressions running along the plate margine eg the chilie peru trench at 8000 km deep and 6000 km long
- rock travels laterally due to tectonics
- oceianinc plate cools becoming more dense and sinks once colliding with the continental creating a deep sea trench
- young fold mountains
- as the two plates oceanic and continental push together t edge of the continental buckles and gets compressed
- shortened laterally increased vetically
- the mountains created considered young as they usually have formed less than 25 million years ago
- the mountains are made up of a mix of igneous continental crust and sedimentary rocks from river deposits and sediment scraped from the oceanic plate as it is subducted
- volcanic activity also expands the mountain range from magma created from the sub ducted oceanic plate
- as the two plates oceanic and continental push together t edge of the continental buckles and gets compressed
- deep sea trenches
- landforms
- continental plate meets continental
- constructive
- oceianic
- sea floor spreading
- convectin currnts causes the rock to travel laterally abouve
- the rock below the lithosphere moves a few cm per year dragging the lithosphere abouve with it
- tensions and high temperatures weaken the plate above until it splits causing a gap to form which is quickly in filled with magmas asthenosphere melts due to a fall in pressure
- forms an ocean ridge as submarine volcanic activity as the less dense basaltic lava forms a ridge along the plate margin
- ocean ridges- eg mid atlantic ridge can rise up to 3000m in hight and formislands such as the Azores
- forms an ocean ridge as submarine volcanic activity as the less dense basaltic lava forms a ridge along the plate margin
- tensions and high temperatures weaken the plate above until it splits causing a gap to form which is quickly in filled with magmas asthenosphere melts due to a fall in pressure
- the rock below the lithosphere moves a few cm per year dragging the lithosphere abouve with it
- convectin currnts causes the rock to travel laterally abouve
- sea floor spreading
- continental
- rift valleys
- the rock travels laterally due to the convection currents
- the high temperatures weaken the plate causing the plate to bulge creating horsts
- between the horsts the crust collapses creating a valley called a graben
- eg the eathiopean highlands and the east africain rift as the somailian plate is splitting from the africain continent
- between the horsts the crust collapses creating a valley called a graben
- the high temperatures weaken the plate causing the plate to bulge creating horsts
- the rock travels laterally due to the convection currents
- rift valleys
- oceianic
- conservative
- hazards
- EARTHQUAKES
- Plates lock and stress builds up forms shallow focus earthquakes
- EARTHQUAKES
- 2 plates sliding alongside each other
- e.g. st Andres fault California and Haiti
- no subduction or magma created no volcanic activitey
- no landforms created
- hazards
- destructive
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