Plate Tectonics
The broken pieces of crust that are floating on top of the molten asthenosphere.
Tectonic Plates
The area where two tectonic plates meet
Plate Boundary
Ocean floor spreading is found at...
Divergent boundaries
Seismic waves carry...
Energy
The name for magma once it reaches the surface of the Earth
lava
The name of the super continent that existed 200-300 million years ago.
Pangea
This type of boundary is made when two plates pull apart from each other
divergent boundary
This often forms when a continental plate converges with a continental plate
Mountains
This type of plate boundary is the leading cause of earthquakes
Tsunamis can be caused by a volcanic eruption or _________
an earthquake
He developed the theory of continental drift
Alfred Wegner
A boundary where two plates slide along each other
Transform
One plate moving below another plate into the mantle
subduction
The point inside the Earth's crust where an earthquake originates.
Focus point
Type of volcano: Small, steep, conical hill
Cinder cone volcano
Lithosphere
Crust and upper mantle
This type of boundary is made when two tectonic plates collide
Convergent
Conservative plate boundaries...
Transform boundary
The location on the surface of the Earth directly above where the earthquake starts
Epicenter
Type of volcano: named for its low profile, very large.
Shield Volcano
The force from this causes the tectonic plates to move
convection currents
Destructive plate boundaries
Continental-oceanic convergent boundary
The African Rift Valley is an example of this type of plate boundary
divergent
We use this scale to measure earthquakes
The Richter scale
Type of volcano: Tall and cone shaped. Layers of ash, lava and tephra. Also called stratovolcano
Composite volcano
What is one piece of evidence that the continents used to all be connected as one super continent?
One of the following:
The apparent fit of continents (puzzle pieces)
Coal from plants in the arctic
Glacial evidence in tropical regions
Fossils of the same animals on different continents
Mountain ranges matching up
Constructive plate boundaries
Divergent boundary
The deepest part of the ocean, The Mariana Trench, is formed by this type of plate boundary
convergent
Earthquakes occur where there are cracks in the Earth's surface called ______
faults
Two types of plate boundaries where volcanoes are most likely to form.
Convergent and divergent.