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Water created gullies on Mars.
NASA scientists think they've developed a strong case that liquid water created the strange gullies discovered on Mars a few years ago. These gullies might indicate underground sites of water, and could be a good place to search for life. Although Mars' environment is too cold, dry and low pressure to support liquid water, it could last a little while as it escaped from an underground reservoir. The lack of debris fields at the ends of these gullies suggests the water froze or evaporated before it reached the bottom.
Around 251 million years ago, something happened to the Earth's climate that wiped out 90-95% of marine life and 70% of terrestrial life. scientists at the National Center for Atmospheric Research (NCAR) have developed a computer model that demonstrates that rapid increases in carbon dioxide belched out of volcanoes did the trick. Temperatures were 10 to 30 degrees Celsius (18 to 54 degrees Fahrenheit) higher than they are today, which broke a cycle that pulled carbon dioxide out of the atmosphere.
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