Презентация по теме 8 класса ( УМК Биболетовой З) "Природные катастрофы" .
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Floods Pupil 8 th « A » class Gymnasiums No. 125 Idiyatova ElvinaСлайд 2
Floods take the first place among natural disasters because of their great area and average annual damage.
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There are six main types of floods. HIGH WATER – is caused by usually spring melting of snow on plains or a rain precipitation, and also spring-and-summer melting of snow in the mountains.
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HIGH WATER can be intensive and periodic. JAM — is a result of ice floes during a spring ice drift in narrow places of the rivers and bends of the bed of the rivers.
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ZAZHOR — a congestion of ice (the end of autumn, the beginning of winter) in the narrow places and bends of the bed of the river. WIND SETUP — is caused by the influence of a wind on a surface of the water, happening usually in sea mouths of the large rivers.
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FLOODS AT BREAKS of DAMBS — it is intensive, usually considerable lifting of a water level in the river (waterway), caused by the break of a damB, or a natural barrier.
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FLOOD CHARACTERISTICS The flooding area Duration of flooding Speed of lifting of a water level
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How to be prepared for the flood Remember the places of storage of boats, rafts and construction materials for their manufacturing. In advance make the list of documents, property and the medicine which are to be taken out during the evacuation. Put into a special suitcase or a backpack necessary warm clothes, a supply of products and medicine.
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After the news about the evacuation at once leave the dangerous zone for the appointed safe area,having taken your documents, the valuables, necessary things, a two-day supply of food. WHAT TO DO during THE flood
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What to do after the flood. Don't use the products which were in touch with water. Don't use water from wells while they won't be cleared.
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