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Isostacy is largely a force in the earth acting how?
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The head of large plumes that form "hot spots" may cause uplift and ____.
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Ch.19 (FInal)
Plate Techtonics
| Question | Answer |
|---|---|
| Isostacy is largely a force in the earth acting how? | none above |
| The head of large plumes that form "hot spots" may cause uplift and ____. | vast fields of flood basalt |
| There’q s one place on earth where you can stand on a large island, be above a hot spot, and see MOR all simultaneously. That place is | Iceland |
| Magnetic declination is | the angle between the magnetic pole and the geographic pole |
| Evidence in support of continental drift includes ____. | all of the choices are correct |
| This type of plate boundary the two plates can consist of ocean-ocean, ocean-continent, or continent-continent crust. | convergent |
| The inner wall of a trench consists of a(n) _____ of thrust-faulted and folded marine sediment and pieces of oceanic crust | accretionary wedge |
| The isotopic ages of Hawaiian Island basalts increase regularly to the ____. | northwest |
| Magma heated by ocean-continent convergence may form a(n) _____ such as the Aleutian Islands | magmatic (island) arc |
| Marine geologists can predict the age of igneous rocks of the sea floor by measuring _____. | magnetic anomalies |
| The portion of a fracture zone between two offset portions of ridge crest is called a ____. | transform fault |
| ____ is the idea that continents move freely over Earth's surface, changing their positions relative to one another. | Continental drift |
| Sea-floor spreading implies that sea-floor rocks should be ______________. | youngest on the crest of mid-ocean ridges |
| The Himalayan Mountains are thought to have formed ____. | by continent-continent convergence |
| What kind of plate boundary will you find 2 segments of MOR offset? | divergent |
| The downward plunge of cold rock at convergent boundaries accounts for the existence of _____. | oceanic trenches |
| Plumes form ______ that are related to areas of active volcanism such as Iceland, Yellowstone and Hawaii. | hot spots |
| The most common type of transform faults offset oceanic ____. | ridge crests |
| The apparent movement of the magnetic poles through geologic time is called _____. | polar wandering |
| A divergent boundary on the sea floor is associated with ______. | mid-oceanic ridges |
| The basic idea of ______ is that the Earth's surface is divided into a few large plates that move slowly relative to one another. | plate tectonics |
| In this hypothesis the two sides of the mid-oceanic ridge are moving in opposite directions like slow conveyor belts. | sea floor spreading |
| Hess's original hypothesis was that sea-floor spreading is driven by deep mantle ____. | convection |
| Most plates move, each year, approximately | 1-12 cm |
| Measured rates of sea-floor spreading range from ______ cm/year. | 1 to 24 |
| Pangea initially separated into two parts, the southern part is called ____. | Gondwanaland |
| After World War II, using extremely sensitive instruments originally designed to detect submarines, it was discovered that the seafloor displayed what? | magnetic anomalies |
| _______ proposed an explanation for magnetic anomalies. | Vine and Matthews |
| Wegener reassembled the continents to form the super continent _____. | Pangea |
| Alaska’s Aleutian Islands, site of some fierce fighting in WWII, are | a volcanic island arc |
| The Peru-Chile trench is moving over the ________ Plate as South America moves west. | Nazca |
| During extension in divergent plate boundaries a rift valley forms as a central ____. | graben |
| Harry Hess proposed that the _______. | sea floor moves |
| In the early 1900s the German meteorologist _____ made a strong case for continental drift. | Alfred Wegener |
| The “action” in plate tectonics, meaning a majority of the earthquakes, mountain-building, and volcanism, mostly takes place | near plate edges |
| These plate boundaries are marked by shallow-focus earthquakes in a narrow zone for a single fault or in a broad zone for a group of parallel faults | transform |
| One kind of convergent plate boundary is ____. | continent-continent convergence |
| When a descending plate reaches a depth of _______ km, magma is generated in the overlying asthenosphere. | 100 |
| The Rift Valley in East Africa is an example of a _____. | diverging plate boundary |
| In plate tectonics, intense geologic activity occurs at ____. | plate boundaries |
| Young mountain belts with their associated igneous intrusions, metamorphism, and fold-thrust belts form at _______. | convergent boundaries |
| Plate motion can be measured directly using ____. | GPS |
| The San Andreas Fault is _________ in California. | a right lateral transform fault |
| Alternating positive and negative polarity magnetic anomalies in the crust form a stripe-like pattern parallel to _____. | mid-oceanic ridges |
| A _____ plate boundary is where plates are moving away from each other. | divergent |
| Divergent plate boundaries can occur where spreading occurs under a continent, for example ___. | the Red Sea |
| India began colliding with Asia about 30 million years ago. The most likely thing that will happen in the geologic future is that | It will halt and be “sutured” onto the south side of Asia |
| ____ volcanoes can be found along subducting plate boundaries. | Andesitic |
| One possible mechanism for plate tectonic drive is ____. | slab pull |
| The ___ includes rocks of the crust and uppermost mantle. | lithosphere |
| What may well happen to old, subducted lithospheric plates (OCTL) | they sink down to the core |
Created by:
Thomas.Siu
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