Dried remains of underground water channels have been discovered on Mars.They appear to have been islands shaped by flowing water.Their depth suggests that they were formed about how many years ago?

Question

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The depth of the channels suggests that they were formed about 500 million years ago. Option A is too recent, option B is too early, and option D is the age of the entire planet.

Dried Remains of Underground Water Channels Have Been Discovered on Mars.They