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Pollution also has a dramatic effect on natural resources. Once contamination occurs, it is difficult or impossible to remove these pollutants from the environment.
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Nondegradable pollutants are materials that either do not decompose or decompose slowly in the These pollutantsīecome a problem when added to the environment faster than they can decompose. Biodegradable pollutantsĪre materials, such as sewage, that rapidly decompose by natural processes. There are two main categories of polluting materials, or pollutants. Although some environmental pollution is a result of natural causes suchĪs volcanic eruptions, most is caused by human activities. Health, the quality of life, or the natural functioning of ecosystems (living organisms and their Pollution is contamination of Earth’s environment with materials that interfere with human Read the following text to answer question 21-25 They therefore breathe air but cannot survive on land. What is the purpose of the text above ?Ī. This is up to 30 cm in thickness and serves to conserve heat and body fluids.ġ5.
#Soal uts bahasa indonesia kelas 8 semester 2 kurikulum 2013 skin#
The skin is smooth and shiny and beneath it lies a layer of fat (blubber). Superficially, the whale looks rather like a fish, but there are important differences in its external structure: its tail consists of a pair of broad, flat, horizontal paddles (the tail of a fish is vertical) and it has a single nostril on top of its large, broad head. Some species are very large indeed and the blue whale, which can exceed 30m in length, is the largest animal to have lived on earth.
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Read the following text to answer question 15-17