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Thread: Geologic History of the Earth

  1. #1 Geologic History of the Earth 
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    I was working on my test review multiple choice questions in my textbook and encountered some that I am not sure about the answer. I hope someone can help me so I won't be studying the wrong answers!

    Choose the best answer:

    1) The geologic time scale is a
    a. scale for weighing rocks
    b. calendar used by geologist
    c. rock record of the earth's past
    d. collection of the same kind of rocks

    I would eliminate a and d, but I am not sure if the correct answer is b or c...

    2) An event that geologists would use in dividing the geologic time scale into smaller units is
    a. the eruption of a volcano
    b. a change in rock color
    c. a change in sediment type
    d. the arrival of an ice age

    I really have no idea...

    3) An important invertebrate in the Paleozoic Era was the
    a. ammonite
    b. trilobite
    c. ostracoderm
    d. stromatolite

    Is the answer b?
    ===============================
    4) Areas of exposed Precambrian rocks that may represent ancient continents are called
    a. shields
    b. fossils
    c. outcrops
    d. cratons

    Is the answer a? or d?

    5) During the Mesozoic Era, new crust was added to western North America in the form of
    a. shields
    b. terranes
    c. cratons
    d. geosynclines

    This one I have no idea...

    6) The Colorado Plateau was uplifted during
    a. Precambrian time
    b. the Paleozoic Era
    c. the Mesozoic Era
    d. the Cenozoic Era

    Is the answer d?

    Thank you for your help!


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  3. #2 Re: Geologic History of the Earth 
    Forum Cosmic Wizard SkinWalker's Avatar
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    Quote Originally Posted by kingwinner
    I was working on my test review multiple choice questions in my textbook and encountered some that I am not sure about the answer. I hope someone can help me so I won't be studying the wrong answers!
    Choose the best answer:

    Quote Originally Posted by kingwinner
    1) The geologic time scale is a
    a. scale for weighing rocks
    b. calendar used by geologist
    c. rock record of the earth's past
    d. collection of the same kind of rocks

    I would eliminate a and d, but I am not sure if the correct answer is b or c...
    b., though it is related to c. The Geologic Time Scale is about relationships between different periods in much the same way a calendar is about relationships between days/weeks/months.

    A little trivia that my geology professor shared with us years ago about the geologic time scale: if a scale model of the geo-time scale were constructed that was as tall as the Empire State building, the amount of time that man has been on this planet would be represented by the width of a dime resting at the very top.

    Quote Originally Posted by kingwinner
    2) An event that geologists would use in dividing the geologic time scale into smaller units is
    a. the eruption of a volcano
    b. a change in rock color
    c. a change in sediment type
    d. the arrival of an ice age

    I really have no idea...
    c., mostly because the change in sediment type invariably marks a new set of depositional forces and new species characteristic to the period.

    Quote Originally Posted by kingwinner
    3) An important invertebrate in the Paleozoic Era was the
    a. ammonite
    b. trilobite
    c. ostracoderm
    d. stromatolite

    Is the answer b?
    yes, b.

    Quote Originally Posted by kingwinner
    ===============================
    4) Areas of exposed Precambrian rocks that may represent ancient continents are called
    a. shields
    b. fossils
    c. outcrops
    d. cratons

    Is the answer a? or d?
    The answer is d.

    Quote Originally Posted by kingwinner
    5) During the Mesozoic Era, new crust was added to western North America in the form of
    a. shields
    b. terranes
    c. cratons
    d. geosynclines

    This one I have no idea...
    The answer is d.

    Quote Originally Posted by kingwinner
    6) The Colorado Plateau was uplifted during
    a. Precambrian time
    b. the Paleozoic Era
    c. the Mesozoic Era
    d. the Cenozoic Era

    Is the answer d?
    Hmmm. Trick question since I've always thought the uplift took place from the Mesozoic to the Cenozoic. But the major uplift probably took place in the late-Mesozoic with continued uplifts in the Cenozoic so the answer is probably c.

    Quote Originally Posted by kingwinner
    Thank you for your help!
    I hope I was of help. But don't take my answers for gospel, check the index of your textbook for "colorado plateau" and the glossary for "geologic time scale," etc. to verify.

    Good luck!


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  4. #3  
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    Thanks for your help! :wink:

    1) Why not c?
    (I checked the glossary, but there isn't a definition for "geologic time scale")

    2) Why not d?

    4) It says "exposed", so would the correct answer be a?

    5) Can you explain how geosynclines can add new crust to the continent? I think b is also a possible answer...but I am not sure...

    6) The correct answer is d, as I checked the index of my textbook
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