Many mountains in Changle county which were composed of basalts in Niushan and Yaoshan formation of Linqu group in New Neogene period are mainly Neo-volcaniccraters.
Volcanic explosion craters such as Dallol form during phreatic eruptions—where rising magma comes into contact with water beneath the surface of the Earth, causing a steam explosion.
像宽干谷这样爆裂的火山口形成于蒸汽喷发的过程中，在那里，上升的岩浆与地表下的水接触形成了蒸汽喷发。
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Magellan mapped more than 98 percent of the surface of Venus, and revealed the planet to be mostly covered by volcanic materials, dotted with a few impact craters.