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4 votes
The grand canyon is approximately 2^9 km long. Mariner Valley is a canyon on mars that is approximately 2^12 km long. About how many times longer is Mariner valley than the grand canyon

User Nick Gunn
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2 Answers

3 votes
zmx hzd chas cha shc has ch asc 
User Marea
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6 votes
I think it would be 2^3. I'm sorry if it's wrong. 
User Dhorelik
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