地理漫步·世界地理英语30篇（8）
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Caves Reveal Earth's Hidden Layers and Time
洞穴揭示地球隐秘层理与时间印记
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Caves form when water dissolves limestone rock underground.地下水溶解地下石灰岩，形成洞穴。
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Stalactites hang from cave ceilings; stalagmites rise from floors.钟乳石悬挂在洞顶，石笋从地面升起。
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Ancient cave paintings in France show early human life clearly.法国的古代洞穴壁画清晰展现了早期人类生活。
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Dripping water leaves mineral layers that record past climates.滴水沉积矿物层，记录过往气候。
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Some caves hold rare species found nowhere else on Earth.一些洞穴栖息着地球上其他地方没有的珍稀物种。
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Scientists study cave air and sediments to track environmental shifts.科学家通过研究洞穴空气和沉积物追踪环境变化。
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The Mammoth Cave system in Kentucky is over 650 km long.肯塔基州猛犸洞穴系统全长超过650公里。
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Caves help us understand how landscapes change over thousands of years.洞穴帮助我们理解地貌数千年来如何演变。