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What Would You Not Expect to See at Locations Where Tectonic Plates Are Subducting?

Written By Monday, 10 January 2022 Add Comment Edit
  • What is the name of the Mesozoic supercontinent that consisted of all of the present continents?

    Eurasia
    Laurasia
    Pangaea
    Gondwanaland

  • When did the supercontinent Pangaea begin to break apart?

    about 10,000 years ago
    about 10 million years ago
    about 200 million years ago
    about 570 million years ago

  • What two scientists proposed the theory of seafloor spreading in he early 1960s?

    Charles Darwin and James Hutton
    Harry Hess and Robert Dietz
    John Butler and Arthur Smite
    F. Vine and D. Mathews

  • The theory of plate tectonics was widely accepted by __________ .

    the end of the 19th century
    about 1950
    about 1960
    about 1970

  • What age are the fossils of the reptile Mesosaurus found in Africa and South America that suggested that the two continents were once together?

    early Cenozoic
    late Mesozoic
    early Mesozoic
    late Paleozoic

  • Approximately how many lithospheric plates are there?

    about 3
    about 6
    about 12
    about 24

  • Which plate is being subducted beneath western South America?

    the Pacific plate
    the South American plate
    the Nazca plate
    the South Atlantic plate

  • How old are the oldest oceanic crustal basalts?

    about 20 million years old
    about 4.0 billion years old
    about 200 million years old
    about 570 million years old

  • New oceanic lithosphere forms at __________ .

    divergent plate boundaries
    convergent plate boundaries
    transform plate boundaries
    all of these are possible

  • Which of the following is not a divergent plate boundary?

    the Great Rift Valley of East Africa
    the East Pacific Rise
    the San Andreas fault
    the Mid-Atlantic Ridge

  • Partial melting and the production of magma takes place at ________ .

    divergent plate boundaries
    ocean-ocean convergent plate boundaries
    ocean-continent plate boundaries
    all of these

  • At what type of plate boundary do shallow-focus earthquakes occur?

    convergent
    divergent
    transform
    all of these

  • The Hawaiian Islands formed at a _________ .

    convergent boundary
    divergent boundary
    transform boundary
    none of these

  • Which of the following are not associated with convergent plate margins?

    deep-focus earthquakes
    rift valleys
    island arcs
    deep-sea trenches

  • The North American plate is bounded by _________ plate boundaries

    convergent
    divergent
    transform
    convergent, divergent, and transform

  • The east coast of North America represents a _________ .

    convergent boundary
    divergent boundary
    transform boundary
    non of these

  • What are ophiolite suites?

    fragments of oceanic lithosphere emplaced on a continent
    groups of seafloor magnetic anomalies
    wedge-shaped packages of sediments that form at passive margins
    micro-continents that have traveled a long distance

  • Transform faults ___________ .

    often offset spreading centers
    can cut across continents
    involve horizontal movement
    all of these

  • Stretching stresses, basaltic lavas, and shallow earthquakes are associated with ______ .

    subduction zones
    continent/continent convergence
    spreading centers
    transform boundaries

  • Compressive stresses, granitic magmas, and intermediate depth earthquakes are associated with __________

    subduction zones
    continent/continent convergence
    spreading centers
    transform boundaries

  • Shearing stresses and shallow earthquakes are associated with:

    subduction zones
    continent/continent convergence
    spreading centers
    transform boundaries

  • If the Atlantic Ocean is widening at a rate of 3 cm per year how far (in kilometers) will it spread in a million years?

    300 kilometers
    30 kilometers
    30 miles
    3 kilometers

  • In 50 million years?

    150 kilometers
    1000 kilometers
    1500 kilometers
    30 kilometers

  • At convergent plate boundaries where oceanic and continental crust meet _________ .

    no associated volcanism occurs
    oceanic crust is subducted
    continental crust is subducted
    oceanic crust is created

  • One remarkable realization associated with the discovery of seafloor spreading was that _____________ .

    the crust of the continents is more dense than the crust of the ocean
    the crust of the oceans is very young relative to the age of the crust of the continents
    mountains are more dense than then mantle
    the rotational poles of the Earth have migrated.

  • Which segment of the Atlantic Ocean opened first?

    northern
    southern
    central
    it all opened at the same time

  • If the Pacific plate and the North American plate continue to move in the same sense, Los Angeles and San Francisco will eventually lie at the same latitude

    True
    False

  • I once saw a bumper sticker that said "Reunite Gondwanaland". Which of the following would not be part of this reconstruction?

    Antacrtica
    Australia
    India south of the Himayala
    North America

  • Loihi excites geologists because it represents a:

    new instrument for detecting volcanic gasses
    new instrument for detecting lava composition
    satellite than can monitor worldwide volcanic activity
    a new volcano that is the youngest in the Hawaiian Island chain.

  • Which of the following is not a chain of volcanic islands associated with ocean-ocean convergence?

    the Aleutian Islands
    the Hawaiian Islands
    the Mariana Islands
    the Philippine Islands

  • Volcanic island arcs are associated with __________ .

    transform plate boundaries
    divergent plate boundaries
    ocean-ocean convergent plate boundaries
    ocean-continent convergent plate boundaries

  • Melange deposits are associated with ______ .

    divergent boundaries
    subduction margins
    transform boundaries
    all of these

  • Which of the following mountains did not form as a result of collision between two continents?

    Appalachians
    Urals
    Andes
    Himalayas

  • Crustal blocks that occur within orogenic belts whose rocks and structures contrast sharply with adjacent provinces are called ________ .

    ophiolites
    sutures
    microplates
    island arcs

  • Which of the following increases with distance from a mid-ocean ridge?

    the age of oceanic lithosphere
    the depth to the sea floor
    the thickness of the lithosphere
    all of the above

    The cross section above depicts magnetized oceanic crust at a spreading center. The "+" symbol indicates normal magnetic bands and the "-" symbol indicates reversed magnetic bands.

  • How many reversals of the Earth's magnetic field are depicted in the diagram?

    3
    4
    6
    7

  • How fast are C and D spreading apart from each other?

    about 2 centimeters per year
    about 5 centimeters per year
    about 10 centimeters per year
    about 100 centimeters per year

  • Lines on the seafloor that connect rocks of the same age are called _________.

    isograds
    isotopes
    isochrons
    isostasy

  • The east coast of North America represents a ___________.

    convergent plate boundary
    divergent plate boundary
    a transform plate boundary
    the east coast of North America is not a plate boundary

  • What are ophiolite suites?

    fragments of oceanic lithosphere emplaced on a continent
    groups of seafloor magnetic anomalies
    wedge-shaped packages of sediment that form at passive margins
    micro-continents that have traveled a long distance

    The diagram above represents an ophiolite suite

  • Which of the following rock types would you least expect to find in layer 1?

    chert
    limestone
    sandstone
    shale

  • What type of rocks make up layer 2

    basalt
    gabbro
    granite
    ultramafics

  • What type of rocks make up layer 3

    basalt
    gabbro
    granite
    ultramafics

  • Where is the Moho in this diagram?

    between layers 1 and 2
    between layers 2 and 3
    between layer 3 and the ultramafic rocks
    beneath the ultramafics

  • Which two layers have the same chemical composition?

    layers 1 and 2
    layers 1 and 3
    layers 2 and 3
    layer 3 and the ultramafics

  • How wide are the crystal mush zones (magma chambers) beneath mid-ocean ridges?

    1 kilometer
    10 kilometers
    100 kilometers
    500 kilometers

  • Sedimentary rocks laid down in a slowly subsiding basin along a receding continental margin are called __________.

    continental shelf deposits
    ophiolite suites
    melange deposits
    fluvial deposits

  • Volcanic island arcs are associated with _________.

    transform plate boundaries
    divergent plate boundaries
    ocean-ocean convergent plate boundaries
    ocean-continent convergent plate boundaries

  • What is the topographic feature at A called

    oceanic basin
    oceanic rift
    spreading center
    oceanic trench

  • Feature B, called a __________, consists of chaotically mixed and deformed rocks.

    forearc basin
    melange
    suture
    turbidite

  • What type of metamorphism occurs in region B?

    high temperature, low pressure
    low temperature, high pressure
    high temperature, high pressure
    low temperature, low pressure

  • Which of the following locations could be represented by this diagram??

    east coast of Africa
    east coast of South America
    west coast of South America
    east coast of North America

    • What Would You Not Expect to See at Locations Where Tectonic Plates Are Subducting?

    Source: https://uh.edu/~jbutler/physical/chap20mult.html

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