North wasn’t always “up” on world maps. North doesn't always mean "up" when it comes to geophysics. Scientists have known for ...

To do so, you simply draw an imaginary line from the top point of the crescent, past the bottom point of the crescent, and down until it hits the horizon. In the Northern Hemisphere the point where ...

14. The weather vane should be able to stand freely at this point. 15. Place the weather vane outside and use the compass to match the north side of the paper plate with magnetic north.

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Over the course of our planet’s history, the field has flipped hundreds of times: Magnetic north has slid toward the bottom of the planet while magnetic south has traveled north. Signatures in ...

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