UNIT 7: FINDING THE WAYBy the 15th century, people on ships and boats solved the problem of finding out what direction they weresailing in and perhaps even more importantly, what direction they needed to go to get back home. Beforethat time, sailors rarely ventured out of sight of land and instead relied on visible landmarks to get fromplace to place. This limited traders and havies to routes close to shore, but the invention of the compasschanged all that.The magnetic compass contains a magnetic element that ahgns itself with the earth's magnetic fieldThink of the earth as a big magnet. It has two magnetic poles, oriented north and south that are very closeto the geographic North and South Poles. When a magnet or a magnetic element (such as the mineralLodestone or a ferrous metal that has been magnetized) is allowed to float freely, it will effectively pointnorth and south, thus showing you which direction you are going in relation to that axis.GeographicNorth PoleMagneticNorth PoloQuestion 21The compass always point towards the north. Which one of the following is the correct explanation forthis?The Earth is a magnet and therefore it attracts the metallic needle of the compass.b) The magnetic needle of the compass aligns itself with the Earth's magnetic fieldc) The Earth's south pole does not have a magnetic pull hence the compass points towards thenorthd) The needle of the compass always points in the upward directionQuestion 22From the image above what can you say about the direction of the magnetic field of the earth. The answerhas been started for you: complete it in terms of geographical north and south poles.The magnetic lines of force of the earth emerge
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