They offer a glimpse of what our earth was like at its birth. 可以从中窥到地球起源时的一斑

19. That have succeeded one another on earth over nearly four billion years.
    无数生命链上的一环
20. And even today,
    直至今天
21. new volcanoes continue to sculpt our landscapes.
    新火山继续塑造着地表风貌
22. They offer a glimpse of what our earth was like at its birth.
    可以从中窥到地球起源时的一斑
23. Molten rock surging from the depths,
    熔岩从地壳深处奔涌而出
24. Solidifying, cracking,
    凝固 爆裂
25. Blistering or spreading in a thin crust,
    冒泡 或者流淌蔓延成薄薄的硬壳

来自《家园 第一部分 Home Part1》第 22 行