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Near to the Earth's surface there are small variations in the Earth's magnetic field, but these don't play a role in providing the magnetosphere which protects the Earth from charged particles emanating chiefly from the solar wind.


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Your rock is granite, an igneous rock of volcanic origin, not sedimentary. It has a similar composition to basalt, but has cooled more slowly and therefore has larger crystals. It is mostly made of quartz, which is usually white, feldspar. mica and hornblende. Hornblende is black, though there are other minerals sometimes found in granite which are also ...


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There are tests that can be done on your specimen to confirm if your specimen is composed of IRON SILICIDE. A more common name for this man-made material is "ferrosilicon". A metallurgist would never call this material an alloy. But it is very "hard" and heavy (high tenacity and s.g.), but it isn't malleable. If your specimen is composed of iron silicide, ...


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