| Terms |
Definitions |
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Continental AND OCEANIC
|
The Earth has two types of crust.
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|
VOLCANOES
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THIS and earthquakes help define the boundaries between the plates
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MAGMA
|
Volcanoes also form between the plates, as _____ rises upward from the
underlying mantle.
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Core
|
the innermost layer below the mantle
(33%)
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|
Sea-floor spreading
|
the process where new crust is formed in the Mid-Ocean Ridge(mountain chain underwater)and older crust is pushed away
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|
Asthenosphere
|
soft layer of rock on which the Lithosphere moves
|
|
3 Theories as to why the Plates Move
|
1-Ridge Push-Oceanic Plates slide down into the Lithosphere and Asthenosphere boundary
2-Convection-hot material rises and cools once it becomes more dense and sinks
3-Slab Pull-Oceanic Plates are more dense and sink causing "Slab Pull"
|
|
Continental Drift
|
a theory by Alfred Wegner that states that continnent drift apaprt from one another (this is only 1/2 true)
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Crust
|
the outermost layer of the earth
(less than 1%)
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Convergent Boundary
|
When plates collide
-----> <------
(in result-a strong earthquake)
|
|
The Theory of Plate Tectonics
|
The theory of Plate Tectonics is that the plates are divided and move on the surdace of the Earth's Lithosphere
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Oceanic Crust
|
newer more dense crust formed in the ocean
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Mid-Atlantic Ridge
|
Underwater mountains in the Atlantic Ocean
|
|
Who discovered it and when?
|
Alfred Wegner-German Scientist
Early 1900's
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|
Pangaea
|
one giant super continent before the plates moved apart from one another
|
|
Divergent Boundary
|
When plates move apart
<----- ----->
(in result-a weak earthquake)
|
|
Sea-floor spreading
|
the process where new crust is formed in the Mid-Ocean Ridge(mountain chain underwater)and older crust is pushed away
|
|
Mantle
|
the layer between the crust and the core
(66%)
|
|
Divergent Boundary
|
When plates move apart
<----- ----->
(in result-a weak earthquake)
|
|
Tectonic Plates
|
the earth is divided into plates that move on top of the Asthenosphere
|
|
Mesosphere
|
middle sphere between the Asthenosphere and the Outer Core
|
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Outer Core
|
liquid rock layer
|
|
Transform Boundary
|
When plates slide
(in result-a stronger earthquake)
|
|
Continental Crust
|
older less dense crust found where the continents are located
|
|
The Theory of Plate Tectonics
|
The theory of Plate Tectonics is that the plates are divided and move on the surdace of the Earth's Lithosphere
|
|
Convergent Boundary
|
When plates collide
-----> <------
(in result-a strong earthquake)
|
|
3 Theories as to why the Plates Move
|
1-Ridge Push-Oceanic Plates slide down into the Lithosphere and Asthenosphere boundary
2-Convection-hot material rises and cools once it becomes more dense and sinks
3-Slab Pull-Oceanic Plates are more dense and sink causing "Slab Pull"
|
|
Transform Boundary
|
When plates slide
(in result-a stronger earthquake)
|
|
Proof Of Wegner's Theory
|
1-The coastlines fit together like puzzle pieces
2-Fossil Evidence-Animal and plant fossilsmatched on different continents
3-Rock Evidence-ROCKS DON'T SWIM!!!
4-Glaciers left marks on mountains as they moved
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Lithosphere
|
the rigid out layer of the crust
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Inner Core
|
solid layer of rock
|
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Mid-Atlantic Ridge
|
Underwater mountains in the Atlantic Ocean
|
