Layers of the earth A
layers of the earth B
Continental Drift
Plate tectonics
Hodge Podge
100
The layer of the earth that we live on.
crust
100
This is the smallest layer, only 5 to 50 km thick.
crust
100
The continental drift theory began because Alfred Wegener noticed that continents seem to fit together like......
puzzle pieces
100
What is the name of the theory that states the earth's crust is made of large sections moving over the mantle.
Plate tectonics
100
What word explains why the layers of the earth are in the order that they are?
density
200
This is the largest layer of the earth, sits below the crust.
mantle
200
A special type of crust that makes up the land on earth.
continental crust
200
Wegener's theory is called what?
continental drift
200
What is the process called that produces new crust?
Sea floor spreading
200
What type of plate boundary occurs where the plates are being pulled apart and making new crust?
divergent
300
The layer of the earth that is liquid.
outer core
300
A special type of crust that makes up the land under the water.
oceanic crust
300
What did Wegener notice about fossils on different continents?
that they lived in the same area when the continents were all together
300
Where is old crust being destroyed?
subduction zones, plate boundaries
300
Plate boundaries that come together are called
convergent
400
The layer of the earth that makes up the central part of the earth.
inner core
400
This layer is molten iron and nickel.
outer core
400
What observation did Wegener notice about mountain ranges on continents that used to be together?
Mountain ranges lined up (continued on) on each continent
400
What causes the plates to move?
Convection currents in the mantle.
400
This type of plate boundary occurs when two plates slide past each other.
Transform
500
This layer is made up of solid nickel and iron.
inner core
500
Describe the state of matter of the mantle.
putty like, semisolid, mouldable
500
What was the name of the continent when they were all together?
Pangaea
500
What has been found in colder climates that helps prove continental drift theory?
Fossils of tropical plants
500
Volcanic islands that do not form near plate boudnaries form over what?
hot spots
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