Exercise
Form 7: Magnetic Reversals and Seafloor Age
Investigate magnetic reversals recorded in oceanic crust and how they help determine seafloor age. See how magnetic patterns support seafloor spreading.
Questions
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MultiChoice
What happens during a geomagnetic or magnetic reversal?
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MultiChoice
How is Earth's magnetic history recorded in rocks on the seafloor?
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MultiChoice
What pattern do magnetic stripes form on the sea floor relative to a mid-ocean ridge?
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MultiChoice
What does the symmetrical pattern of magnetic stripes prove?
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MultiChoice
How old is the oldest oceanic crust found on Earth today?
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MultiChoice
Why is continental crust much older than oceanic crust?
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MultiChoice
What scientific instrument measures magnetic signals trapped in seafloor rocks?
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MultiChoice
In rocks formed during 'normal polarity', magnetic minerals point toward which direction?
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MultiChoice
In rocks formed during 'reversed polarity', magnetic minerals point toward which direction?
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MultiChoice
What generates Earth's magnetic field?
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MultiChoice
What sampling technique confirmed that seafloor rock age increases with distance from ridges?
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MultiChoice
What trend in rock age is observed as you travel farther away from a mid-ocean ridge?