The most powerful plume in nature is volcanic plume , which is formed by ejection of mixture of pyroclasts and volcanic gases in to the air from volcanic vent 世界上中最壮现的羽流现象是由爆炸性火山喷发的各种火山气体、细粒的火山喷发碎屑物所组成的火山喷发柱，也就是我们俗称的火山蘑菇云。
" we have opened an observation post near the site for tourists so that visitors can observe this natural spectacle , " he said . the last time the volcano erupted was in 1979 上述声明说，这次火山喷发“不会给这些居民带来危险”而作为一项预防措施，位于谢拉内格拉火山附近的旅游中心已被关闭。
Its existing shows that neighborhood of shidongkou fault zone once arises acid volcanic eruption in neoid period and provides new important information with basic geological study of guizhou 它的存在，显示了施洞口断裂带附近，挽近地质时期曾有酸性火山喷发活动，为贵州基础地质研究提供了新的重要信息。
Since the first diamond was found at the crater of diamonds in 1906 , the park had several different owners until the state of kansas made it a state park in 1972 钻石在地球的内部深处形成，那里高温和压力为碳原子的紧密结合创造了必要的条件。根据科学家的研究， 1亿年前在钻石坑附近的火山喷发把钻石带到了地球表面。
The team collected 65 - million - year - old droppings from the volcanic deccan traps of central india in order to study the diet of titanosaurs , the group of super - size dinosaurs that includes diplodocus 他们这支队伍从印度中部火山喷发形成的德干岩群中收集了长达6500万年的粪便，用以研究雷龙? ?与梁龙同属超级大恐龙? ?的饮食结构。
Earth ' s large size ( about 12 , 740 kilometers across ) ensures that this heat is lost relatively slowly , which explains why our planet still has a molten outer core and volcanic eruptions at its surface 地球因为体积巨大（直径约1万2740公里） ，使热能损耗得相当慢，这说明了为什麽地球至今仍有著熔融的外核，而且地表还有火山喷发。
