How Has the Age of Mercury's Intercrater Plains Been Estimated

question 150

Multiple Choice

How has the age of Mercury's intercrater plains been estimated?

• A) from residual radioactivity within the plains compared to areas outside, as measured by the Mariner 10 spacecraft
• B) by comparing the albedo of the plains to areas outside because material becomes lighter as it gets older, as it does on the Moon
• C) from radioactive dating of rocks returned to Earth by the Mariner 10 spacecraft
• D) by comparing the number of craters per unit area within the plains to areas outside

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