Ch 7
Where are tectonic plates located
At earths surface
Name the correct order of rifting events
Crystal upward , Rift Valley , linear Sean, ocean
Which plates boundary is not associated with volcanic eruption
Transform
Why are volcanoes not found at transform boundaries
Transform boundaries do not cause change to the pressure temperature or composition of the mantle
When do new oceans form
When a continent is broken apart by a divergent boundary
What causes melting of material under divergent plate boundaries
Decompression of rock
What are the three types of plates boundaries
Divergent convergent and transform
What kind of plate motion is associated with the mountain range that goes around the world what is its name
Divergent motion and mid ocean ridge
How does the lithosphere differ from the asenthosphere
The lithosphere is tends to break while the asthenosphere flows, the lithosphere overlies the asthenosphere
The East African rift is a divergent plate boundary that is splitting the continent of African into two pieces what will eventually form around this divergent boundary
An ocean
Where are most modern divergent plate boundaries found
At mid ocean ridges
What sequence of rocks would you expect Rift Valley evolution to produce from oldest to youngest
Volcanic rocks, clastic sedimentary rocks, deep sea sedimentary rocks
What surface feature provides evidence for the location of hot spots
Volcanoes with tectonic plates
In general where do volcanoes form in subduction zones
On the overriding plate away form the convergent boundary
Oceanic lithosphere contains oceanic crust and the
Outermost part of the mantle beneath the oceanic crust
How do plates move at divergent plates boundaries
Plates move apart
How do plates moves at convergent plate boundaries
Plates moves towards one another
Where would you expect to see deep ocean trenches
Oceanic oceanic convergent boundaries
Why are volcanic chains associated with convergent boundaries plates
Partial melting occurs due to subduction
What are two differences between oceanic crust and continental crust
The continental crust is thicker and less dense than oceanic crust
Which of the following statements is a part of the continental drift hypothesis
The continents of Pugh America and Africa for together like pieces of a puzzle , a single super continent consisting of all earths masses once existed
What is the relationship between the mantle and the lithosphere
Some of the mantle is contained within a smaller layer called the lithosphere
Which of the following process drive plates tectonic
Subduction and convection
How do plates move at transform plates boundaries
Plates slide past one another
Why are oceanic ridges more elevated than the rest of the sea floor
Ridges are elevated because the rocks are hot
Which fault in Southern California was created by the sliding of the pacific plate past the North American plate
San Andreas fault
Why were North American geologist so resistant to wegeners idea
Scientists demanded an explanation on how it worked as
What is convention
A cycle of moving material formed by the rise of less dense material and sinking of denser material
Where does the lithospheric form
A divergent plate boundary
What surface feature would you expect to form if both a hot spot and tectonic plate are stationary
A single volcano
What is a plume
A zone of upwelling material originating at the outer core mantle boundary
Which feature connects the South American parana and African entedeka flood basalts
Sea mount chains
What is the relationship between the crust and the lithosphere
All of the crust is contained within a larger layer called the lithosphere
What is the relationship between the mantle and the asthenosphere
All the asthenosphere is contained within a larger layer called the mantle
Which type of tectonic boundary is the result of two tectonic plates colliding with each other
Convergent boundary
Which of the following statements about earthquakes with magnitude greater the 4.0 is most accurate
Earthquakes with magnitude greater that 4.0 occur in a pattern than correlates with plate boundaries
Which of the following locations is a modern day example of an active rift
East Africa and the Red Sea
What accounts for most tectonic plate motion
Forces at subduction zones
What features at the surface provide evidence of plumes
Hot spots
At a subduction zone where oceanic lithosphere meets continental lithosphere which would subduction and why
The oceanic lithosphere would subduct because it has a higher density at 3.0 grams
Where do most divergent boundaries originate
Within continents
What is a hot spot
An area of volcanism by a mantle
In a collision between two continental plates can a continental plate subduct why or why not
Continental plates are too buoyant to subduct
In general where do earthquakes and volcanic eruption occurs
Convergent plates boundaries and divergent plates boundaries
The gulf of Aden represents which part of the rifting sequence
Linear sea
Which of the following is a layer of the earth that is classified not by composition but by physical properties
Asthenosphere
Which type of plate boundary is most closely associated with uplifting continental regions and mountains building
Convergent boundaries
Which of the following terms best characterizes upwelling in the asthenosphere
Diffuse
Which phenomenon can explain the presence of volcanoes in the middle of the Pacific Ocean
Hot spots
What is the relationship between temperature and density
In general warmer materials are less dense and colder material are denser
What happens to the lithosphere at transform plate boundaries
Lithosphere is neither destroyed nor created simply maintained or conserved
How is the thickness of the lithosphere going to change as it moves away from a divergent plate boundary
Lithosphere will thicken as more mantle is added
What forms at divergent plates boundaries
New oceanic lithosphere
Which type of faulting is associated with the development of new ocean floor
Normal faulting
What is the main material being subducted at an ocean continent convergent boundary
Oceanic lithosphere
Which of the following features is considered a destructive plate margin
Subduction zone
How are transform boundaries different from the other two types of plate boundaries
Tectonic plates slide past each other
Which type of tectonic boundary is the result of two tectonic plates sliding past each other
Transform boundary
When will a hot spots volcano become extinct
When the volcano is carried away from the hot spot by the tectonic plates