NASA scientists recreate Mars's spider-shaped geologic formations in lab for the first time
Tests on Earth appear to confirm how the red planet's spider-shaped geologic formations are carved by carbon dioxide.
Tests on Earth appear to confirm how the red planet's spider-shaped geologic formations are carved by carbon dioxide.
Planetary Sciences
11 hours ago
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The Amazon rainforest is home to a remarkable variety of plants and animals not found anywhere else on Earth, with some species only located in certain areas, but the reason for this has perplexed and divided scientists for ...
Ecology
14 hours ago
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Ice is a solid phase, usually crystalline, of a non-metallic substance that is liquid or gas at room temperature, such as carbon dioxide ice (dry ice), ammonia ice, or methane ice. However, the predominant use of the term ice is for water ice, technically restricted to one of the 15 known crystalline phases of water. In non-scientific contexts, the term usually means ice Ih, which is known to be the most abundant of these solid phases. It can appear transparent or opaque bluish-white colour, depending on the presence of impurities or air inclusions. The addition of other materials such as soil may further alter the appearance.
The most common phase transition to ice Ih occurs when liquid water is cooled below 0°C (273.15K, 32°F) at standard atmospheric pressure. It can also deposit from vapour with no intervening liquid phase, such as in the formation of frost.
Ice appears in nature in forms as varied as snowflakes, hail, icicles, glaciers, pack ice, and entire polar ice caps. It is an important component of the global climate, and plays an important role of the water cycle. Furthermore, ice has numerous cultural applications, from ice cooling of drinks to winter sports and the art of (ice sculpting).
The word is derived from Old English ís, which in turn stems from Proto-Germanic *isaz.
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