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    steph00814's Avatar
    steph00814 Posts: 3, Reputation: 1
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    #1

    Oct 25, 2007, 06:14 AM
    Tectonic plate movement
    How would you work out this question?

    An island chain is 2100 km long and the ages of the rocks of the 2 end islands differ by 42 million years, what is the average rate of plate movement in cm yr-1
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Oct 25, 2007, 06:29 AM
    The average speed of an object is simply the distance travelled divided by the time. So here you divide 2100 km by 42 million years, and then convert the units to cm/yr. Work it out, then post back with the answer you get and we'll check it for you.
    steph00814's Avatar
    steph00814 Posts: 3, Reputation: 1
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    #3

    Oct 25, 2007, 10:03 AM
    OK so:

    2100 / 42 million= 0.00005

    0.00005 converted = 5 cm yr-1
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Oct 25, 2007, 10:10 AM
    You got it.
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