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19 votes
19 votes
The Grand Canyon is approximately 29 kilometers long. Mariner Valley is a canyon on Mars that is approximately 212 kilometers long. About

longer is Mariner Valley than the Grand Canyon?
2
O 2^3
O 2^21
O 2^108

User Ishuar
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1 Answer

13 votes
13 votes
I’m not sure if I’m correct but I think it is 2^21
User Eamonn Kenny
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