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A pure substance is not the same as a natural substance. For example, honey and olive oil are natural substances, but they are not pure substances. They are mixtures.
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Hydrocarbons, such as petroleum and its derivates, are the simplest type of organic molecules. They are made up of carbon and hydrogen atoms and come from the remains of organisms that died millions of…
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Louis Pasteur was one of the most prominent scientists in the study of microorganisms. One very important contribution was his discovery of the process of pasteurisation. With pasteurisation, harmful or…
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Equivalents of some units of area: 1 km2 = 106 m2; 1 hm2 = 104 m2 1 m2 = 104 cm2; 1 hm2 = 102 dam Equivalents of some units of volume: 1 m3 = 103 dm3 = 106 cm3 1 L = 1 dm3
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Low clouds are clusters of tiny drops of water. At high altitudes, water vapour cools and condenses into liquid water.
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One of the most serious problems in civil wars in LEDCs is child soldiers. It is estimated that some 300000 children and teenagers are currently active in military conflicts worldwide.
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The big multinationals control 75 % of world trade. The number of multinational companies has risen from 7 000 in the early 1960s to 85 000 at the beginning of the 21st century. The sales of the…
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EduBook Organización
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When we want water, we just turn on the water tap and out it comes. But water is a very scarce resource. We should not waste or pollute water. Remember, more than 2 billion people do not have access to…
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EduBook Organización
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Oil comes from the decomposition of the remains of microscopic organisms that lived millions of years ago. Oil is the most important natural material for industrial development. It is used to make…
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EduBook Organización
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The international prototype of the kilogram, or standard kilogram, is a cylindrical object made of an alloy of platinum-iridium kept under very controlled conditions in the International Bureau of…