Term
| What was the name of the supercontinent ? |
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Definition
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Term
| What did Wegener argue must have once joined based on fossils ? |
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Definition
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Term
| What does rock evidence exists in the form of ? |
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Definition
| several mountain belts that end at one coastline |
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Term
| Where were areas of glacial till found ? |
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Definition
| Southern Africa,South America,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 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
| Unequal distribution of heat within earth |
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Term
| What are also called spreading center ? |
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Definition
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Term
| What happens at convergent boundaries ? |
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Definition
| where two plates move together,causing oceanic lithosphere plunging beneath over riding plate and descending into the mantle |
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Term
| What is an example of a transform plate boundary ? |
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Definition
| margins where two plates grind each other without the production or destruction of lithosphere |
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Term
| What two things continuously add oceanic lithosphere ? |
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Definition
| Fractures and constructive plate margins |
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Term
| What is the longest physical feature on Earth's surface ? |
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Definition
| The system of oceanic ridge |
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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 |
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Term
| What two things control convergent boundaries ? |
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Definition
| Type of crust involved and the forces acting on the plate |
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Term
| What happens when two oceanic slabs converge ? |
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Definition
| one descends beneath the other,this causes volcanic activity |
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Term
| What happens at transform plate boundaries ? |
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Definition
| earthquakes occur where there are transformed boundaries. |
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Term
| Where are most transform plate boundaries located ? |
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Definition
| Most transform plate boundaries are located within the ocean basins,a few cut through the continental crust |
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Term
| What is normal polarity ? |
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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 seafloor 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
| Scientist found a close link between deep-focus earthquakes and ocean tranches |
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Term
| What was the drilling ship 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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