Alfred Wegner
Oceanic Crust
Plate Tectonics
Earth layers
Plate Movement
100
Alfred Wegners theory that the continents had moved over time
Continental Drift
100
Sonar revealed a long continuous mountain chain near the center of the oceans. We call this the ____ _____ _______.
Mid ocean ridge
100
Plate Tectonics was not a widely accepted theory until the _________(decade)
1960's
100
The thickest layer of the Earth
Mantle
100
Plates moving away from one another
Divergent
200
Alfred Wegner theorized that all the continents had at one time been joined together in a ______________ that he called Pangea
Supercontinent
200
The oldest ocean crust will be (closest to/ furthest from) the axis of the mid ocean ridge.
Furthest from
200
Plate tectonics was a revolutionary theory for the field of geology. We call this a ________________
Paradigm shift
200
The upper mantle that is solid but reaches temperatures that allow for a highly viscous flow
asthenosphere
200
One of the mechanisms that drives plate movement at subduction zones
Slab pull
300
What was the geologic evidence that Alfred Wegner used to support his theory?
Similar rock types in the Appalachians and Scottish Highlands
300
The oceanic crust is colder and denser in (younger/older) crust
Older
300
Tectonic Plates move from ____ to ____cm per year
1-10
300
Composed of the crust and upper, ridged portion of the mantle
Lithosphere
300
A feature that will develop from plate subduction
Trench or volcanic arc
400
Alfred Wegner used the distribution of Mesosaurus fossils to support his theory. The Mesosaurus was a freshwater reptile found where?
In South America and Africa
400
What happens when two oceanic plates converge?
The older, colder, denser plate subducts.
400
The strongest evidence for the theory of plate tectonics
Sea floor spreading
400
Seismic waves that can travel through solids, liquids (and gases).
P waves or compression waves
400
A divergent boundary that forms in continental crust will first form a
Rift Valley
500
Glacial deposits found close to the equator indicated that the continents had moved. This type of evidence is called _____________.
Paleoclimate
500
Iron rich minerals orient themselves parallel to Earth's magnetic field resulting in a "zebra stripe" pattern mirrored on the MOR.
Magnetic Anomalies
500
One of the founding fathers of plate tectonics
Harry Hess
500
Responsible for the Earth's magnetic field, this layer is composed primarily of molten iron and nickel
Outer core
500
The type of boundary shown here
Right lateral transform