contoh soal un fisika sma beserta pembahasannya

The problem of improving environmental hygiene, conserving resources, and finding alternative sources of fuel may be unrelated. Improper waste disposal spreads disease, contaminates water sources and provides breeding ground for diseases-carrying insects. Rural areas of developing countries are also plagued by a lack of adequate sanitation. But burning dung destroys its values as fertilizer, thus depriving the soil of the much needed source of humus and nitrogen.

The search for firewood occupies a large part of the working day and has resulted in widespread deforestation.ĭung is in constant supply wherever there are farm animals and, when dried, it is convenient to store and use. But kerosene is now priced out of reach of many people and wood, except in heavily forested areas, is in short supply. Rural communities depend largely on kerosene, wood and dung for their cooking and lighting needs. In almost all developing countries, the lack of adequate supplies of cheap, convenient and reliable fuel is major problem.

Contoh soal un fisika sma beserta pembahasannya