Scientists can determine the age of the seafloor by watching the constant changing magnetic field of our planet. When it cools down, it records the magnetic field during its formation. The two parts of the oceanic plate are pulled apart, and magnetic stripes become older as they move away from the mid-ocean ridge. Hope that helps!
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A space cushion is a certain amount of distance you keep between you and the car in front of you that allows you to easily maneuver in any condition. A typical space cushion in perfect conditions would be about 3 seconds between you and the car in front of you.
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