Survey Chapter 9

What was the name of the super continent?
Pangaea, meaning all land
What did Wegener argue must have once been joined based on fossils?
South America and Africa must have been joined
What does rock evidence exists in the form of?
Rock evidence is continental drift exist in the form of several mountain belts that end at one coastline, only to reappear on a landmass across the ocean
Where did areas of glacial till found?
LAYERS of glacial till were found in Southern Africa and South America, as well as India and Australia.
What could Wegener not describe?
Wegner could not describe a mechanism that was capable of moving the continents across the globe
What is the new theory known as?
The new theory was known as plate tectonics
What are the segments of the lithosphere called?
Plates
What is the movement driven by?
The movement is driven by the unequal distribution of heat within earth
What are also called spreading centers?
Divergerant boundaries
What happens at convergent boundaries?
Two plates move together
What is an example of a transform plate boundary
Transform plate boundaries are margins where two plates grind past each other without the production or destruction of the lithosphere
What two things continuously add oceanic lithosphere?
Spreading and up welling of magma continuously adds oceanic lithosphere
What is the longest physical feature on earths surface?
The system of ocean ridges is the longest physical feature on earths surface
What is the process by which new oceanic lithosphere is produced?
Seafloor spreading is the process by which plate tectonics produce new oceanic lithosphere
What are subduction zones?
Destructive plate margins where oceanic crust is being push down in the mantle
What two things control convergent boundaries?
The type of crust involved forces acting on the plate
What happens when two oceanic slabs converge?
What happens at transform plate boundaries?
At transform plate boundaries, plates grind past each other without destroying the lithosphere
Where are most transform plate boundaries located?
What is normal polarity?
What is the strongest evidence of seafloor spreading?
What close link is obvious?
What was the drilling ship used from 1968 to 1983 named?
What is the basic driving force for plate movement?