The dry mountain ranges of the western United States contain rocks dating back 440 to 510 million years, to the Ordovician period, and teeming with evidence of tropical marine life.

美国西部干燥的山脉包含了距今4.4亿至5.1亿年前的奥陶纪岩石，其中充斥着热带海洋生物生存的迹象。

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Risking his life, Joe jumped back into the cold water and managed to drag (拽) his dad up onto some rocks.

乔冒着生命危险跳回寒冷的水中，成功把他爸爸拖到一些岩石上。

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And today many scientists think that all of the alleged signs of life in the rocks could have just as easily been made on a lifeless planet.

而今，大多数科学家认为，岩石上所有已知的生命迹象都能够轻易地在一个无生命的星球发生。

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Well into old age he could be spotted, in bright red parka and with frozen beard, lying full-length on the Antarctic sandstone to snap some tiny life-containing fissure in the rocks.

ECONOMIST: Imre Friedmann

Jesalva said he was in the group that spent the night on the picturesque mountain, known for its almost-perfect cone, when the volcano rumbled back to life early in the morning and rocks "as big as a living room" came raining down on them.

NPR: Philippine Volcano Spews Rocks, Killing 5 Climbers

Yet, some of the most promising locations to search for ancient life on Mars are places where water may have been in contact with volcanic rocks, ancient hydrothermal systems where conditions may have been conducive to life.

CNN: How the search for aliens can help sustain life on Earth