Tuesday, October 23 rd. How do convection currents form ? a. heated mantle material is less dense and rises to the top of the asthenosphere b. mantle material cools under the lithosphere, becomes more dense, and sinks c. seismic waves act like a big spoon and stir up mantle material
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How do convection currents form?
a. heated mantle material is less dense and rises to the top of the asthenosphere
b. mantle material cools under the lithosphere, becomes more dense, and sinks
c. seismic waves act like a big spoon and stir up mantle material
d. both a and b are correct
What did one mountain say to the other after the earthquake?
“It isn’t my fault”
10 pts Each
Individual and Group
earth's crust can come together.
a. Continental crust to continental
b. Continental crust to oceanic
c. Oceanic crust to oceanic
a. Continentalcrust to continentalcrust
Indian plate (continental crust) running into Eurasian plate (continental crust)
The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is called
Oceanic crust is MORE DENSE than Continental!
all from: http://www.geo.lsa.umich.edu/~crlb/COURSES/270
Volcanoes form where a convergent boundary occurs between oceanic crust and continental crust.
South American plate (continental crust) running into Nazca plate (oceanic crust)
Andes Mts. From space plate (oceanic crust)
View looking south – ocean to continental
Volcanoes also form where a convergent boundary occurs between oceanic crust and oceanic crust.
Aleutian islands of Alaska are volcanoes formed by oceanic crust converging with oceanic crust
Following volcanic islands in the Pacific Ocean can show us where oceanic crust is being subducted by oceanic crust.
Can you explain this diagram!?
This is a model of sea floor spreading at a divergentboundaryis called a mid ocean ridge.
Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge?
The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball!
Continental crust diverging from continental
slide past each other.
A transform boundary is a place where two plates slip past each other, moving in opposite directions.