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One piece of evidence is that there are many dry river channels in the martian Southern Hemisphere, like those found on earth. This suggests that water made these channels, and that means that at some point there was water on mars. Water means that the temperature was above 320F for at least some part of the year, and that it was humid enough so that the water would not instantly evaporate.

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12y ago
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12y ago

Make it have more carbon dioxide and cause it to have a green house effect.

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11y ago

An extinct shield volcano

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12y ago

well, maybe because of Martian volcanoes

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12y ago

ice crystals

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Q: What type of evidence found on Mars suggests that Mars may have been a warmer place and had a thicker atmosphere?
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