Biology, 15.07.2019 05:00, jdjdjdjdjjffi7273

If you have ever used a compass, you know that it can be used to navigate. it does this with a needle that always points north, so you know which direction you are heading. the needle points to the north because earth is like a giant magnet, with both north and south poles. according to current theory, the creation of earth's magnetic field is closely linked to

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If you have ever used a compass, you know that it can be used to navigate. it does this with a need...