OCEANOGRAPHY HELP

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Ridge systems are about how many kilometers wide? I get 65,000, but the answer needs to be a choice amongst 10 km, 50 km, 100 km, 500 km, or 1000 km. I have spent too much time on this already. Please help if you can. Thanks

In miles they range from 8 miles to 30 miles. So 50 km is about the maximium width.

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