So we can see the agglomerations progress in size from west to east, and the iron changes in the same way," Cole explains. Since the chemical composition of the rocks was the same, this indicates they were originally identical, leading scientists to believe that something happened to the rocks to make them different.
So what caused the changes in the rocks? Cole hypothesizes that acidic water vapor from volcanic eruptions is behind the changes. Similar to the volcanic smog, or “vog,” we see on Earth, when the corrosive Martian vog landed on the bedrock, it would have dissolved some of the minerals, forming a gel. Once the water vapor evaporated, a cement-like agent was left behind and resulted in the agglomerations.
So we can see the agglomerations progress in size from west to east, and the iron changes in the same way," Cole explains. Since the chemical composition of the rocks was the same, this indicates they were originally identical, leading scientists to believe that something happened to the rocks to make them different.So what caused the changes in the rocks? Cole hypothesizes that acidic water vapor from volcanic eruptions is behind the changes. Similar to the volcanic smog, or “vog,” we see on Earth, when the corrosive Martian vog landed on the bedrock, it would have dissolved some of the minerals, forming a gel. Once the water vapor evaporated, a cement-like agent was left behind and resulted in the agglomerations.
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