Kilauea, the world's most active volcano located on the Big Island of Hawaii, for many years has been considered fairly gentle, as relatively few people have been killed following its explosions. Recently, however, the scientists revealed Kilauea's deadly face. Apparently, the volcano has an extensive layer of ash and rock called tephra that can be blasted high enough to be a hazard to passenger airplanes. The golf ball-size rocks can be thrown 17 kilometres (11 miles) out. The last time tephra erupted was between 500 and 200 years ago
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