The stress forces that acts on divergent boundaries
What is tension?
100
These are created when continental-continental crust collides
What are mountain ranges?
100
The stress force associated with transform boundaries
What is shearing?
100
The technology used to map the ocean floor
What is sonar?
100
The theory that Earth's plates are in constant, slow motion
What is the theory of plate tectonics?
200
When divergent boundaries develop on land, these landforms are created.
What are rift valleys?
200
Valleys in the ocean floor created by the collision of oceanic-oceanic crust or oceanic-continental crust.
What are trenches?
200
The way the plates move in relation to one another at a transform boundary
What is slide past each other in two opposite directions?
200
The name of the supercontinent that that began to break apart 225 million years ago.
What is Pangea?
200
Scientists rejected Wegener's theory of plate tectonics because of this reason.
What is what is the cause of the movement of the continents?
300
An underwater chain of mountains created where two oceanic plates diverge.
What is the mid-ocean ridge?
300
This is what happens when two plates of oceanic crust collide.
What is one plate is subducted beneath the other?
300
The event that can take place when stress builds up and finally breaks at a transform boundary
What is an earthquake or a fault?
300
Geologist who mapped the ocean floor and discovered sea floor spreading
Who is Harry Hess?
300
The oceanic crust consists mainly of __________ (name of rock) and the continental crust consists of ___________ (name of rock).
What is basalt and what is granite?
400
The measure of how much mass there is in the volume of a substance.
What is density?
400
The process where the denser crust is forced back into the mantle to be recycled
What is subduction?
400
This fault is near the place where the North American and Pacific Plate share a transform boundary
What is the San Andreas Fault
400
This is the part of the mantle that can bend like plastic.
What is the aesthenosphere?
400
This is what happens to the cooler, denser fluid in a convection current.
What is sink to the bottom?
500
3 pieces of evidence that supports the theory of plate tectonics.
What is new crust forming at the mid-ocean ridge, magnetic striping, and drilling samples that show the youngest rock is near the mid-ocean ridge?
500
The Pacific plate is sliding past the North American plate. It has taken 10 million years for the plate to move 600 km. Find the Pacific plate's rate of motion in cm/year.
What is 6 cm/year?
500
Many transform faults are found along this long, underwater chain of mountains
What is the mid-ocean ridge?
500
This pattern of rocks on the ocean floor shows us the earth's magnetic field has reversed several times.