Test # 63
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1300 questions in 130 tests. Each test contains 10 questions.
Idiom of the Day
get on one`s high horse
to behave with arrogance
Our boss likes to get on his high horse and give orders to everyone.
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The earths magnetic field
Hold a soft iron bar pointing to the north and sloping downwards, and hammer it several times. It will become slightly magnetic.The earth is surrounded by magnetic field lines, which meet the earth in Great Britain and North America at an angle between 60 and 80 degrees. When the iron is hammered, its magnet particles are affected by the earths magnetic field lines and point to the north. In a similar way, tools sometimes become magnetic for no apparent reason. If you hold a magnetised bar in an east west direction and hammer it, it loses its magnetism.