Term
| What was the same of the super-continent? |
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Definition
| Pangaea, meaning "all land" |
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Term
| What did Wegener argue must have once been joined based on fossils? |
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Definition
| South America and Africa must have been joined. |
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Term
| What does rock evidence exist in the form of? |
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Definition
| Rock evidence for continental drift exists in the form of several mountain belts that end at one coastline, only to reappear on a landmass across the ocean. |
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Term
| Where were areas of glacial till found? |
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Definition
| Layers of glacial till were found in southern Africa and South America, as well as India and Australia. |
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Term
| What could Wegener not describe? |
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Definition
| A mechanism that was capable of moving the continents across the globe. |
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Term
| What is the new theory known as? |
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Definition
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Term
| What are the segments of the lithosphere called? |
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Definition
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Term
| What is the movement driven by? |
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Definition
| The unequal distribution of heat within Earth |
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Term
| What are also called spreading centers? |
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Definition
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Term
| What happens at convergent boundaries? |
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Definition
| Two plates move together. |
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Term
| What is an example of a transform plate boundary? |
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Definition
| Transform boundaries are margins where two plates grind past each other without the production or destruction of the lithosphere. |
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Term
| What two things continuously add oceanic lithosphere? |
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Definition
| Spreading and upwelling of magma continuously adds oceanic lithosphere. |
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Term
| What is the longest physical feature on Earth's surface? |
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Definition
| The system of ocean ridges is the longest physical feature on Earth's surface. |
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Term
| What is the process by which new oceanic lithosphere is produced? |
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Definition
| Seafloor spreading is the process by which plate tectonics produces new oceanic lithosphere. |
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Term
| What are subduction zones? |
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Definition
| Destructive plate margins where oceanic crust is being pushed down into the mantle are called subduction zones. |
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Term
| What two things control convergent boundaries? |
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Definition
1. type of crust
2. forces acting on plate |
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Term
| What happens when two oceanic slabs converge? |
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Definition
| One descends beneath the other. Cuaes volcanic activity similar to what occurs at an oceanic-continental boundary. Volcanoes form in the ocean instead of on land. New land consisting of an arc shaped chain of small islands called a volcanic island arc. |
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Term
| What happens at transform plate boundaries? |
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Definition
| Plates grind past each other without destroying the lithosphere |
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Term
| Where are most transform plate boundaries located? |
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Definition
| Within the ocean basins, but few cut through the continental crust. Ex. San Andreas Fault (California) |
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Term
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Definition
| When rocks show the same magnetism as the present magnetic field |
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Term
| What is the strongest evidence of sea-floor spreading? |
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Definition
| The discovery of strips of alternating polarity, which lie as mirror images across the ocean ridges |
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Term
| What close link is obvious? |
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Definition
| Scientists found a close link between deep-focus earthquakes and ocean trenches. Also, the absence of deep-focus earthquakes along the oceanic ridge system was shown to be consistent with the new theory. |
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Term
| What was the drilling ship used from 1968 to 1983 named? |
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Definition
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Term
| What is the basic driving force for plate movement? |
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Definition
| Convection occurring in the mantle is the basic driving force for plate movement |
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