Wegner/Hess
Boundaries
Earth Structure
Earthquakes/Volcanoes
Tsunami
100
Alfred Wegner theorized this.
What is Continental Drift
100
Continental movement is caused by this boundary.
What is a divergent boundary
100
The __ is solid and made primarily of __ and __.
What is the inner core is solid and made primarily of iron and nickel?
100
These are breaks in the earth's crust.
What are faults?
100
Tsunamis hitting America are more likely to impact.
Where is the west coast? In 2013 a tsunami hit New Jersey.
200
His theory came from finding.
What are rock formations, fossils, and plants?
200
Earthquakes along the west coast are primarily caused by this boundary.
What is a transform boundary?
200
The __makes up about __% of earth's mass.
What is the mantel makes up about 85% of earth's mass?
200
Earthquakes are caused by
What is a sudden slip on a fault?
200
Tsunamis can also happen at __ and in ___
What inland seas and large bodies of water?
300
Harry Hess found this, evolving Wegner's theory.
What is the Mid-Atlantic ridge?
300
Plates move due to
What is circulation of convection currents in the asthenosphere?
300
The continental crust varies in thickness from __ to __
What is 4.8-50km or estimate of 3-30mi?
300
The majority of earthquakes occur at __ or __ faults
What are thrust and reverse faults?
300
Other than an earthquake, a tsunami may be caused by
What are landslides, volcanoes, and weather?
400
This is the mechanism used to map the sea floor.
What is sonar mapping?
400
Two plates pulling apart forms a
What is a rift valley?
400
Magnetism is created by
What is the outer core moving around the inner core?
400
A connection between earthquakes and volcanoes are
When magma exerts pressure on rocks beneath the volcano?
400
Scientists believe that near earth objects could generate a tsunami. Evidence shows this by
What is the Chicxulub impact on Mexico’s Yucatán Peninsula 65 mya?
500
This is what Harry Hess found.
What are mountain ridges and trenches were being formed by seafloor spreading?
500
The divergent boundary on the east coast is causing the ___ to become ____, and the ____ to get ____
What is the Atlantic becoming larger and the Pacific smaller?
500
The outer core is the second largest layer with a thickness of
What is 2200km or 1367mi
500
Earthquakes occur in ___ and continue ___ below the surface.
What is the crust and continues 400 mi beneath earth's surface?
500
The connection between volcanos and tsunamis
What are: Pyroclastic flows (flowing mixtures of rock fragments, gas, and ash) Submarine explosions relatively near the ocean surface Caldera formation (volcanic collapse) Landslides (e.g., flank collapse, debris flows) Lateral blasts (sideways eruptions)
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