4.1 Evidence of Plate Motions
What is Wegner's hypothesis about Earth's landmasses slowly breaking apart called?
Continental Drift
The ocean crust is (more/less) dense than the continental crust
MORE
Which of the 3 types of stress pulls on earth's crust, stretching the rock to make it thinner?
(Tension, compression, or shearing)
Tension
Name one of the types of volcanoes.
Composite
cinder cone
lava plateau
shield
Name the 3 plate boundaries
Convergent
divergent
transform
Name one of the ways scientists found evidence of continental drift...
Land Features
Fossils
Climate
Which is thicker, the oceanic crust or the continental crust?
Continental
Normal fault
reverse fault
strike slip fault
Name the material that is responsible for the type of magma that will occur.
Silica
What type of seismic waves come after the primary waves?
Secondary
In the Oceanic crust, mid-ocean ridges run accross the floor of the ocean. At these ridges is something called _______ _________ spreading.
Sea Floor Spreading
Boiling water and plate tectonics both experience movement from __________ ___________
Convection Currents
What is a characteristic of Primary waves?
Travel the fastest
first to arrive
compress and expand
When water is trapped at a convergent boundary and mixes with material in the mantle, it can cause a ___________ if the material reaches the surface before cooling.
Volcano
Scientists finding tropical plants remains on an island in the Arctic Ocean is an example of what kind of evidence?
Evidence from Climate
The sinking of ocean crust back into the mantle is called what?
Subduction
(Cooler/Warmer) rock rises and (cooler/warmer) rock sinks in the mantle forming convection currents
Warmer
cooler
Earthquakes can cause ocean floor uplift. Ocean floor uplift and landslides can both be causes of what?
Tsunamis
High silica will have (thin and runny/thick and sticky) magma, and will have a/an (easy flowing, explosive, quiet) eruption.
Thick and sticky
explosive
mid-ocean ridges
rift valleys
Subduction occurs where?
Ocean Trenches
Earthquakes often occur along plate boundaries. The region around the Pacific Ocean where many boundaries occur, that is prone to many earthquakes and volcanic activity is called what?
Ring of Fire
In a normal fault usually occurs at a (divergent,convergent,transform) plate boundary. The (hanging wall, footwall) slips down as the plates pull apart. This creates mountains and valleys.
divergent
hanging wall
What is the device used by volcanologists to measure if a volcano is swelling as its magma chamber fills up?
Tiltmeter
What movie character threatens the good guy with "Liquid Hot Magma"?
Dr. Evil