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    tconnection360's Avatar
    tconnection360 Posts: 19, Reputation: 1
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    #1

    Mar 3, 2013, 11:08 PM
    Ocean crust rate question
    How long would it take to form 2,000 kilometers of ocean crust at a rate of 5 centimeters per year?

    Answer
    A) 10 million years
    B) 20 million years
    C) 30 million years
    C) 40 million years
    I'm not asking for an answer, but I'd appreciate help in solving it. I don't know how to figure it out. Much appreciated! Cheers
    Wondergirl's Avatar
    Wondergirl Posts: 37,769, Reputation: 5427
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    #2

    Mar 3, 2013, 11:16 PM
    Change kilometers to centimeters, or vice versa, so you have the same unit of measure.

    5cm = 0.000050000km
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    tconnection360 Posts: 19, Reputation: 1
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    #3

    Mar 3, 2013, 11:21 PM
    Quote Originally Posted by Wondergirl View Post
    Change kilometers to centimeters, or vice versa, so you have the same unit of measure.

    5cm = 0.000050000km
    So would it be 10 million years? Do I just divide it or what?
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    Wondergirl Posts: 37,769, Reputation: 5427
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    #4

    Mar 3, 2013, 11:23 PM
    Quote Originally Posted by tconnection360 View Post
    so would it be 10 million years? do i just divide it or what?
    What grade are you in?
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    #5

    Mar 3, 2013, 11:25 PM
    Quote Originally Posted by Wondergirl View Post
    What grade are you in?
    11th.. please help! I'm really stressing out on this question
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    Wondergirl Posts: 37,769, Reputation: 5427
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    #6

    Mar 3, 2013, 11:26 PM
    Is this for homeschooling or real school?
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    Wondergirl Posts: 37,769, Reputation: 5427
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    #7

    Mar 3, 2013, 11:28 PM
    5 cm = 1 year

    0.00005 km = 1 year
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    tconnection360 Posts: 19, Reputation: 1
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    #8

    Mar 3, 2013, 11:28 PM
    Quote Originally Posted by Wondergirl View Post
    Is this for homeschooling or real school?
    Real school. I really need help in solving this.. please please please. I'd greatly appreciate it!
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    Wondergirl Posts: 37,769, Reputation: 5427
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    #9

    Mar 3, 2013, 11:36 PM
    Seems like I am doing the entire problem for you.

    5 cm = 1 year

    0.00005 km = 1 year

    Flip the last equation around and plug in each year amount to find out how many kms.

    1 year = 0.00005 km.
    2 years = ?
    10,000,000 years = ?
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    tconnection360 Posts: 19, Reputation: 1
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    #10

    Mar 3, 2013, 11:45 PM
    Quote Originally Posted by Wondergirl View Post
    Seems like I am doing the entire problem for you.

    5 cm = 1 year

    0.00005 km = 1 year

    Flip the last equation around and plug in each year amount to find out how many kms.

    1 year = 0.00005 km.
    2 years = ?
    10,000,000 years = ?
    So I multiplied it for 2,000 km and it was .1 so its 10 million years! Correct?
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    tconnection360 Posts: 19, Reputation: 1
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    #11

    Mar 3, 2013, 11:54 PM
    Quote Originally Posted by Wondergirl View Post
    Seems like I am doing the entire problem for you.

    5 cm = 1 year

    0.00005 km = 1 year

    Flip the last equation around and plug in each year amount to find out how many kms.

    1 year = 0.00005 km.
    2 years = ?
    10,000,000 years = ?
    Oh wait is it 40 million years?
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    Wondergirl Posts: 37,769, Reputation: 5427
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    #12

    Mar 4, 2013, 12:05 AM
    10,000,000 years = 10,000,000 x 0.00005 = ?
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    tconnection360 Posts: 19, Reputation: 1
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    #13

    Mar 4, 2013, 12:08 AM
    Quote Originally Posted by wondergirl View Post
    10,000,000 years = 10,000,000 x 0.00005 = ?
    500...
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    Wondergirl Posts: 37,769, Reputation: 5427
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    #14

    Mar 4, 2013, 12:14 AM
    So 10 Million years would be only 500 km. of ocean crust.
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    #15

    Mar 4, 2013, 12:25 AM
    Quote Originally Posted by Wondergirl View Post
    So 10 Million years would be only 500 km. of ocean crust.
    Gotcha.. 40! Thanks so much

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