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