大约30亿年前，洪水形成了流出通道，大约与北部火山平原形成的时间相同。
Flooding shaped the outflow channels approximately 3 billion years ago, about the same times as the northern volcanic plains formed.
其他岛屿是通过如火山作用的地质作用形成的，没有陆地生命。
The other islands, which emerged via geological processes such as volcanism, possessed no terrestrial life.
洞穴的形成需要火山气体和热量的稳定释放，海拔高到足以防止每年的大量降雪在夏季融化。
The cave-making recipe calls for a steady emission of volcanic gas and heat, a heavy annual snowfall at an elevation high enough to keep it from melting during the summer.
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