The white material at the top of the cliff, near the planet's North Pole, is carbon dioxide ice.

照片上显示的悬崖上的白色物质是位于火星北极地区的干冰。

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Its surface temperature matches that of carbon dioxide ice, but might water ice lie underneath?

那里的地面温度符合使二氧化碳冰冻的温度，但在那之下是否还潜伏著水冰？

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Spring has sprung on Mars, bring with itthe disappearance of carbon dioxide ice (dry ice) that covers the northpolar sand dunes.

春天在火星上跃动，覆盖在北极沙丘上的二氧化碳干冰消失了。

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The rise and fall in both temperature and carbon dioxide, evident in Antarctic ice cores, was at first thought to be evidence of carbon dioxide driving climate change.

WSJ: Matt Ridley on Confirmation Bias and Global Warming | Mind & Matter

An annual winter chills the southern hemisphere, creating around the pole a frost composed in large part of frozen carbon dioxide, or dry ice.

CNN: Summer is 'sublime' in sunny south of Mars

Much of it resulted from volcanoes blasting out gases like carbon dioxide and water vapour, which allowed ice (also a mineral) to form near the poles of Earth, and possibly on Mars too.

ECONOMIST: Minerals