Show:
Earthquakes
Volcanoes
Plate Tectonics
Sea Floor Spreading
Contential Drift
100
earthquake waves are called this
What are seismic waves?
100
the molten material that flows onto Earth's surface
What is lava?
100
plates grind past each other sliding back and forth against each other
What is a transform boundary?
100
the youngest part of the ocean floor are found here
Where are ocean ridges?
100
because of matching coastlines of the continents if they were fit together like a puzzle
What made early map makers and scientist believe that continents had moved?
200
strike-slip faults are caused by these type of forces
What are shear forces?
200
magma
What is molten rock beneath the Earth's surface called?
200
plates move apart
What is a divergent boundary?
200
old crust is recycled back into the earth's mantle by subduction
What happens at an ocean to ocean convergent boundary?
200
convection currents
What happens in the asthenosphere that causes the plates to move?
300
p-waves
What type of waves travel fastest through rocks?
300
above hot spots
Where do the most active volcanoes usually appear?
300
the layer of the earth that tectonic plates move on?
What is the asthenosphere?
300
the age of ocean crust near ocean ridges compared to the crust near deep sea trenches
What is much younger?
300
movement occurs along fractures in rocks
What happens when stress overcomes the strength of rocks involved and they can't hold the pressure anymore?
400
the Mercalli scale measures this of an earthquake
What is the intensity of an earthquake?
400
the farthest away from a hot spot
Where does the least active volcanoes appear?
400
the downward pull of a convection current cause the sinking force to do at a subduction zone?
What pulls tectonic plates towards one another?
400
creates new ocean crust
What does each cycle of spreading and intrusion of magma during seafloor spreading result in producing?
400
a vast underwater mountain chain
What are ocean ridges?
500
because the North American Plate and the Pacific Plate meet here
Why is there is a high risk of earthquakes on the Pacific coast of the United States?
500
wood, because of its flexibility
What is the best type of material to build a structure from in earthquake prone areas?
500
very tall mountain ranges
What does continental to continental plate collision produce?
500
very large ocean ridges
What is found near divergent boundaries in the ocean?
500
a narrow, elongated depression in the seafloor where old crust is being subducted back into the earth's mantle.?
What is a deep sea trench?