Divergent Boundaries
The stress forces that acts on divergent boundaries
What is tension?
These are created when continental-continental crust collide
What are mountain ranges?
The stress force associated with transform boundaries
What is shearing?
The technology used to map the ocean floor
What is sonar?
Moving away from a hot spot tends to reveal __________ (younger/older) volcanoes and more evidence of what landforms that are now underwater?
Older volcanoes; evidence of seamounts
Valleys in the ocean floor created by the collision and subsequent subduction of oceanic-oceanic crust or oceanic-continental crust.
What are trenches?
The way the plates move in relation to one another at a transform boundary
What is slide past each other in two opposite directions?
This pattern in rocks on the ocean floor shows us the Earth's magnetic field has reversed several times
What is magnetic striping
Volcanoes that do not develop along plate boundaries are a result of this phenomenon
What are mantle plumes/hot spots
An underwater chain of mountains created where oceanic-oceanic crust diverges
What is the mid-ocean ridge?
A chain of islands formed when oceanic-oceanic crust converges
What are volcanic island arcs?
The event that can take place when stress builds up and finally breaks at a transform boundary
What is an earthquake?
Geologist who mapped the ocean floor and discovered sea floor spreading
Who is Harry Hess
The stress force that occurs at convergent boundaries
What is compression?
This landform in Africa is created as the African Plate and the Somalia Plate diverge.
What is the Great Rift Valley?
What is destructive?
This fault is near the place where the North American and Pacific Plate share a transform boundary
What is the San Andreas Fault
Seafloor spreading describes this process
What is divergence or constructive process
Continental crust is _______ (thicker/thinner) than oceanic crust and is also __________ (less dense/more dense) than oceanic crust
What is THICKER; LESS DENSE
The magnetic evidence that shows the oldest rocks are far away from the ridge and the youngest rocks are closest; iron minerals in rocks can reveal when earth had reversed polarity
What is paleomagnetism?
An example of volcanic mountains formed by the collision of continental-oceanic crust.
What are the Andes Mountains?
Many transform faults are found along this long, underwater chain of mountains in the Atlantic
What is the mid-ocean ridge?
Finally provided a mechanism for the movement of continents to support this theory
What is the theory of continental drift?
This mountain range formed when India converged with Eurasia
What are the Himalayas?