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Restless Earth
- the Earths Structure
- The Crust :is the Outer shell
of the Earth
- Two Types
- Continental Crust
- Carries Land
- Are THICKER (35km) but LESS DENSE
- Is OLDER than Oceanic Crust
- Continental Crust is PERMENTANT
and NOT DESTROYED
- e.g. North
American Plate
- e.g. North
American Plate
- Continental Crust is PERMENTANT
and NOT DESTROYED
- Is OLDER than Oceanic Crust
- Carries Land
- Oceanic Crust
- Carries Ocean
- Is THINNER (7km) but DENSER than the
Continental Crust and therefore SINKS
- Is YOUNGER than Continental Crust
- Oceanic Crust is continually
being FORMED and DESTROYED
- e.g. Pacific Plate
- e.g. Pacific Plate
- Oceanic Crust is continually
being FORMED and DESTROYED
- Is YOUNGER than Continental Crust
- Carries Ocean
- Continental Crust
- Two Types
- the Mantle is Layers of Molten Rock and the widest
section of the Earth
- the Inner Core is The very hot
centre of the Earth
- the Outer Core is The liquid layer surrounding the inner core,
which is also made up of iron and nickel
- Plates: Huge Scabs of the Crust
- Plate Boundary: The place where
two plates meet
- Pangae
- Around 200 million years ago the
continents were joined together to form a
Super Continent called Pangae
- Pangae began breaking up and since
then the continents have been drifting
away (Continental Drift)
- Pangae began breaking up and since
then the continents have been drifting
away (Continental Drift)
- Evidence
- Shapes of the continects today look as though
they fit together E.g. South America and Africa
- There are similar patterns of rocks/plants and similar
fossils found have been found in both continents
- Shapes of the continects today look as though
they fit together E.g. South America and Africa
- Around 200 million years ago the
continents were joined together to form a
Super Continent called Pangae
- The Crust :is the Outer shell
of the Earth
- Plates
- 7 major plates and many smaller ones
- North American plate
- South American plate
- Eurasian plate
- African plate
- Indo-Australian plate
- Pacific plate
- Nazca plate
- North American plate
- Destructive Plate Boundaries
- At an destructive plate boundary the plates are
moving together. The denser oceanic crust sinks
into the mantle where it melts in the subduction
zone. the nergy may be released as an earthquake
and the molten magma may rise upwards causing
a volcanic eruptiion. The continental crust becomes
crumpled into fold mountains.
- At an destructive plate boundary the plates are
moving together. The denser oceanic crust sinks
into the mantle where it melts in the subduction
zone. the nergy may be released as an earthquake
and the molten magma may rise upwards causing
a volcanic eruptiion. The continental crust becomes
crumpled into fold mountains.
- Constructive Plate Boundaries
- At a Constructive Plate Boundary the
Plates are moving apart. This type of
movement mostly happens under the
oceans. The gap left is filled with magma
rising up from the mantle below the
volcanoes. Some of these volcanoes have
become large enough to form volcanic
islands such as iceland and Hawaii.
- At a Constructive Plate Boundary the
Plates are moving apart. This type of
movement mostly happens under the
oceans. The gap left is filled with magma
rising up from the mantle below the
volcanoes. Some of these volcanoes have
become large enough to form volcanic
islands such as iceland and Hawaii.
- Conservative Plate Boundaries
- The plates are moving past each other either
in the same or opposite directions. They are
sometimes called passive margins. The two plates
meet at a fault and the pressure builds up until the
two plates jerk past each other. This can cause an
earthquake and the land at the fault becomes
crumpled and rigid. A good example is the San
Andreas fault in California.
- The plates are moving past each other either
in the same or opposite directions. They are
sometimes called passive margins. The two plates
meet at a fault and the pressure builds up until the
two plates jerk past each other. This can cause an
earthquake and the land at the fault becomes
crumpled and rigid. A good example is the San
Andreas fault in California.
- 7 major plates and many smaller ones
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