1427897
Description
Mind Map by RachelBean, updated more than 1 year ago
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Created by RachelBean
about 10 years ago
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Plate Margins
- Conservative Plate Boundary
- Where two plates meet and pass past each other. There
are NO VOLCANOES as there is no subduction or volcanic
activity
- Movement of the plates is erratic
therefore pressure builds and
causes sudden movement which
results in earthquakes
- Case Study:
San Andreas
Fault Line
- Destructive Subduction Plate Boundary
- Rhyolitic, acidic lava, high in
silica, potentially explosive
eruptions with pyroclastic
flow, lava bombs, ash and
dust, infrequent eruptions,
can go through long dormant
periods, creates large stratovolcanoes
- Where two plates move towards each
other, the oceanic plate subducts beneath
the continental plate as it is denser, it melts
as it comes into contact with the
asthenosphere, this then rises and causes a
volcano on the surface on the continental
plates. This also occurs with two oceanic
plates where the faster plate subducts.
- Case Study:
Pacific Ring of
Fire
- Conservative Plate Boundary
- Basaltic, low viscious lava, low in sillica,
frequent eruptions, can be
continuous, form shield
volcanoes, NOT violent
eruptions gases easily escape
- Two plates move apart
from each other and
magma rises adding
new land to the plates
- Case Study:
Mid- Atlantic
Ridge (Oceanic Ridge)
- Case Study:
Eastern African
Rift Valley (Rift
Valley)
- Destructive Collision Plate Boundary
- Two continental plates collide but there is no
subduction therefore there are no volcanoes. Instead
the sediment on the crust is forced upwards and
folds into huge mountain ranges, this movement
causes earthquakes
- Case Study:
Himilayas/Alps
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