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The tsunamis were caused by asteroids striking the ocean. Both were thought to have been strong enough to create 30 km diameter craters. The first tsunami picked up and carried boulders the size of cars or small houses. The backwash from the wave formed channels by rearranging the boulders. The second came in when the ocean was 300 m lower.
These were first discovered by the Mars Global Surveyor. Alternate theories for the creation of surface gullies and channels include wind erosion, [92] liquid carbon dioxide, [93] and liquid methane. [94] Below are some of the many hundreds of gullies that have been studied with HiRISE.
During the oppositions of 1651, 1653 and 1655, when the planet made its closest approaches to the Earth, the Italian astronomer Giovanni Battista Riccioli and his student Francesco Maria Grimaldi noted patches of differing reflectivity on Mars. [27] The first person to draw a map of Mars that displayed terrain features was the Dutch astronomer ...
At first, the team thought the “strange rocks” were part of the debris from the channel, perhaps a layer that water had transported from higher up the mountain, Vasavada said.
These were first discovered by the Mars Global Surveyor. Alternate theories for the creation of surface gullies and channels include wind erosion, [55] liquid carbon dioxide, [56] and liquid methane. [57] Observations with HiRISE show widespread activity in southern hemisphere gullies, especially in those that appear fresh.
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Also, MB found that much of the iron in Paso Robles soil was of the oxidized, Fe +++ form, which would happen if water had been present. [13] Towards the middle of the six-year mission (a mission that was supposed to last only 90 days), large amounts of pure silica were found in the soil. The silica could have come from the interaction of soil ...
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