The compounds that make up the Earth separate into three different layers because of their _______.
Density
100
Alfred Wegener said that all the continents were once together in a super-continent called:
Pangaea
100
When the shape of rocks is changed because of stress.
deformation
100
Another word for an earthquake's strength.
magnitude
100
A volcano that has gently sloping sides.
shield volcano
200
The outermost layer of Earth based on its COMPOSITION.
crust
200
These are formed as hot, less-dense material below Earth's crust is forced upward as the ocean plates move apart.
mid-ocean ridges
200
When two continental plates collide and push rock upward without breaking, what kind of mountain is formed?
folded mountains
200
A force created by stress pulling an object.
tension
200
Cool, stiff lava that forms jumbled heaps of sharp chunks near the vent.
blocky lava
300
These waves change speeds when they move through different densities. Scientists use them to find the composition of the Earth.
seismic waves
300
At this boundary type, two plates move together.
Then one of three things will happen: one plate may sink under the other; one plate may bend and slide under the other; or both may crumple
convergent boundary
300
The plate boundary type that formed the Andes Mountains in South America.
A convergent boundary
300
The scale used to measure earthquake strength.
Richter Magnitude Scale
300
The magma containing a lot of silica and water vapor creates this type of volcanic eruption:
explosive volcanic eruptions
400
The liquid part of the core.
outer core
400
Occurs when oceanic crust (which is denser than continental crust) collides with continental crust.
subduction
400
When a mountain range boarders the ocean, this is normally also off the coast.
What is ocean trench.
400
The place directly above where an earth quake starts
epicenter
400
A volcano created from alternating layers of ash and lava- usually very explosive