Flashcards in Plate Tectonic Review Deck (40):
Which crust is the densest?(oceanic or continental) What type of Rock is each made of?
What is the boundary between the crust and mantle?
Temperature and pressure __________as you go further into the Earth
Who was the scientist that came up with the idea of Continental Drift?
What was his evidence that Alfred Wegner used?
Fossil evidence rocks climate
Define the theory of plate tectonics
Earth’s crust is broken into plates that move due to forces inside earth
What was the name of the last supercontinent?
What drives the movement of the plates?
Convection currents in mantle
Define convection currents:
The currents in the mantle that drive plate tectonics
How many major plates is the earth divided into?____what causes the shifting of the plates?______________________
Study of the record of the earth’s magnetic field in rocks
Why is the oceanic crust youngest at the ridges?
it is the most recently formed
What are subduction zones and where are they located?
at convergent boundaries where one plate is pushed under the other
where is crust created?
where is crust destroyed?
what types of tectonic plate boundaries exist?
compare the terms ridge-push? Slab-pull?
ridge push-buayant magina pushes up driving plates apart
slab-pull- old dense heavy plate sinks
list and define three types of stress?
what is a fold? Fracture? Fault?
fold-rocks bend, but do not break
fracture- rocks break but do not move
fault- rocks break and move their positions
what are your different types of faults? Which stress causes each?
which stress and fault is found along the San Andreas?
what is a hot spot?
volcanic activity that is not found at plate boundary
which type of volcano tends to be most violent?
cinder, strato, super
compare pyroclastic material and lahar flows.
pyroclastic flow-gas/ash that flows, lahar flow- flow of rocks/muds
what does the Richter scale measure?
magnitude of earthquake
on the richter scale how much stronger is an 8.0 than a 7.0?
what is a p-wave? S-wave? L-wave?
P-twice as fast as S-wave
S-1/2 as fast as P-wave (only in solid)
how do you locate an earthquake?
triangulation of earthquakes
where in the world are most earthquakes located?
ring of fire
what instrument records and detects earthquakes?
compare the terms epicenter and focus.
focus-where fault moves
epicenter- on earth's surface directly above focus
what are the 5 types of mountains? How is each formed?
Fault Break-formed by fault
Dome-molten rock pushes layers of rock
Plateau Ieroded-formed when plateau's are pushed up and erode
Volcanic-formed when molten rock erupts onto earth's surface
Does not pass through the earth’s interior at all
Squeezes and pulls rocks in the same direction as the wave travels
Mountains that form when large pieces of crust are tilted from faulting
Mountains that form magma rises through the crust and pushes up
Mountains that formed tectonic movement that has squeezed rocks where continents collided
A vast underwater mountain chain forms at a
Stress is that cause material to pull apart