1. What are the three plate boundaries, a de- scription of the di- rection in which they move 2. Features of continen- tal plate (4) Features of oceanic plate (4) 3. What is the structure of the earth starting from the inside (7) 4. Describe what hap- pens at a constructive plate bound...
a de scription of the di rection in which they move 2 features of continen tal plate 4 features of oceanic plate 4 3 what is the structure of
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Physical geography AS level
Physical geography AS level
Physical geography AS level
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1. What are the three
1. Divergent/Constructive (Move away
plate boundaries, a
from each other)
de- scription of the di-
rection in which they
2.Convergent/Destructive (Move towards
move
each oth- er)
3. Conservative (Rub against each other)
2. Features of continen-
*Continental*
tal plate (4)
- Land on top of shelf
Features of oceanic - Not so dense: made of granite
plate (4) - Permanent: cannot be created or destroyed
- 35-75km thick
*Oceanic*
- Oceans on top of shelf
- Denser: made of basalt
- Can be destroyed
- 6-10km thick
3. What is the structure
of the earth starting 1. Inner core
from the inside (7) 2. Outer core
3. Mantle
4. Mesosphere
5. Asthenosphere
6. Lithosphere
7. Crust
4. Describe what hap-
pens at a constructive *Process*
plate boundary and 1.Radioactive decay in the core causes
the landforms convection currents which pulls the two
associated with it (2) oceanic plates apart.
Give one examples 2. As the plates move apart, pressure is
of destructive bound- released and magma rises from the
aries mantle to the earth's surface.
E.g. Eurasian and North American plates at
Mid-At- lantic Ridge
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*Landforms*
1. Mid ocean ridges e.g. Mid Atlantic Ridge
2. Shield volcanoes e.g. Iceland
5. Describe the formation *Mid-Ocean Ridge*
of a mid ocean ridge 1. An ocean ridge is a linear belt of
(Definition + 3 other mountains where two oceanic plates move
steps) apart at a con- structive plate boundary.
About 90% of ridges are underwater.
2.Convection currents drag plates away
from each other.
3. Pressure is released and magma rises
through cracks in the earths crust to fill the
gap, pushing the sea floor laterally (Sea
floor spreading).
4. As magma cools it builds upper time to
form a series of underwater mountain
chains as well as a rift-valley in the centre
where magma can escape from.
6. Define sea floor
spreading (Def + 2 1. Sea floor spreading is the lateral
oth- er steps) increase of the size of the sea floor as
plates move apart at constructive plate
boundaries.
2.Magma rises to the surface through
cracks in the earths crust and fills the gap.
3.This process occurs at mid ocean ridges
where new ocean floor is formed by
volcanic activity and then gradually moves
2/
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from the ridge as new magma comes to the surface.
3/
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7. Describe what hap- *Process*
pens at a destructive Radioactive decay in the core causes
plate boundary and convection currents which pushes the
the landforms plates towards each other. As they move
associated with it (3)towards each other the more dense plate
subducts beneath the other where
Give two examples it melts into the Benioff zone where it
of destructive bound- becomes molten magma. Can be oceanic
aries meeting continen- tal or oceanic meeting
oceanic.
E.g. South American and Nazca plates
(O/C), Pa- cific and Atlantic (O/O)
*Landforms*
1. Fold Mountains (O/C or C/C)
2. Ocean trenches (O/O or O/C)
3. Island arcs (O/O
8. Describe the formation Formation 1 (O/C) Andes:
of fold mountains 1. Occurs at a destructive boundary. CC
(An- des and moves plates together.
Himalayas) 2. Oceanic plate is subducted under
continental where it melts into Benioff
Zone.
3. During subduction the rocks on the
continental shelf are forced upwards due
to the large amount of compression when
two plates collide.
4.The sediments deposited in the ocean
trench are scraped up by the front edge of
the continental plate and added to the
folded rock. This is called an accretionary
wedge.
Formation 2 (C/C) Himalayas:
1. Occurs at a destructive boundary. CC
moves plates together.
2. Plates move together and as they
4/
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