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"Рециклинг шин: технологии и оборудование"

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Переработка шин и резинотехнических изделий – одна из наиболее актуальных проблем, из числа поставленных мировым автомобилестроением перед человечеством.

Когда земля уходит из-под ног, или Что такое карстовая воронка

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Когда земля уходит из-под ног, или Что такое карстовая воронка
 

Когда земля уходит из-под ног, или Что такое карстовая воронка


В случаях, когда под землю внезапно проваливаются люди, дома и целые населённые пункты, геологи говорят об образовании так называемых карстовых воронок. Что это такое и много ли в России и мире подобных опасных мест?
 
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