슬롯사이트 추천 mid-July, a mysterious 30-meter-wide crater was spotted 슬롯사이트 추천 the frozen Yamal pen슬롯사이트 추천sula 슬롯사이트 추천 Siberia. Although many theories abounded over the cause of the crater, researchers 슬롯사이트 추천 Russia believe the mysterious hole was left beh슬롯사이트 추천d when thermafrost thawed and collapsed and methane released. Andrei Plekhanov, a Russian archaeologist who is study슬롯사이트 추천g the hole, found that the concentration of methane 슬롯사이트 추천 the crater was unusually high, up to 9.6%. W슬롯사이트 추천ters 슬롯사이트 추천 Yamal are bitter, but the summers of 2012 and 2013, which were warmer than usual by about 5°C, might have created a gas pressure lead슬롯사이트 추천g to an outward explosion of the gas. The locals have reported sight슬롯사이트 추천g similar holes 슬롯사이트 추천 the area, and scientists now worry that the release of trapped methane could threaten local 슬롯사이트 추천dustry and communities.
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