The cenotes are, in effect, gigantic fresh water wells. 沼穴于是成了巨大的淡水井 Away from the life-giving rays of sunshine 这里远离给予生命的阳光 one might not expect to find plants. 似乎不太可能会有植物 But in the darkness of the cave tunnels 但是在黑暗的洞穴通道内 roots of giant t...
Yet their impact on life on the surface has been huge. 然而它们对地面上的生物 却有着极其深远的影响 500 years ago they supported one of the world's great civilisations 500年前 它们维系着 一个世界上最伟大的文明 the Maya. 玛雅 Mexico's Yucatan Peninsula has no rivers, lakes o...
500 years ago they supported one of the world's great civilisations 500年前 它们维系着 一个世界上最伟大的文明 the Maya. 玛雅 Mexico's Yucatan Peninsula has no rivers, lakes or streams 墨西哥的尤卡坦半岛 没有河流、湖泊和小溪 so the Maya relied on the cenotes - the flooded...
the Maya. 玛雅 Mexico's Yucatan Peninsula has no rivers, lakes or streams 墨西哥的尤卡坦半岛 没有河流、湖泊和小溪 so the Maya relied on the cenotes - the flooded entrances to the water-filled caves. 因此玛雅文化完全依赖于沼穴 ——地下水洞的入口 These flooded shafts are the regio...
can take many thousands of years to develop. 经历了数千年的形成过程 But sometimes the formations in a cave stop growing altogether. 但有时洞穴内的这些活动会完全停止 These flooded caves in Mexico have remained virtually unchanged for thousands of years. 墨西哥的这些水洞 几千年来几...
But sometimes the formations in a cave stop growing altogether. 但有时洞穴内的这些活动会完全停止 These flooded caves in Mexico have remained virtually unchanged for thousands of years. 墨西哥的这些水洞 几千年来几乎保持不变 Since the last Ice Age they've become cut off f...
These flooded caves in Mexico have remained virtually unchanged for thousands of years. 墨西哥的这些水洞 几千年来几乎保持不变 Since the last Ice Age they've become cut off from the outside world. 自从上一个冰川期以来 它们便已和外界隔绝 Yet their impact on life on the surfa...
Since the last Ice Age they've become cut off from the outside world. 自从上一个冰川期以来 它们便已和外界隔绝 Yet their impact on life on the surface has been huge. 然而它们对地面上的生物 却有着极其深远的影响 500 years ago they supported one of the world's great civilisat...
the slow deposition of dissolved limestone. 都是由水溶碳酸钙缓慢沉淀而来 And when stalactite meets stalagmite 钟乳石与石笋相遇后 a column is born. 便形成了石柱 Structures like these in North America's Carlsbad Cavern 北美洲卡尔斯巴德溶洞中的这些构造 can take many thousands of year...
And when stalactite meets stalagmite 钟乳石与石笋相遇后 a column is born. 便形成了石柱 Structures like these in North America's Carlsbad Cavern 北美洲卡尔斯巴德溶洞中的这些构造 can take many thousands of years to develop. 经历了数千年的形成过程 But sometimes the formations in a...