Which Is the Best Description of a Mid-Ocean Ridge

question 142

Multiple Choice

Which is the best description of a mid-ocean ridge?

• A)thick sequences of folded and faulted sedimentary rocks pushed up 500-1000 metres above the regional seafloor
• B)narrow ridges 5-10 kilometres wide, 3-4 kilometres high, and 10-50 kilometres long with active erupting volcanoes every 1-2 kilometres of ridge length
• C)1000 to 4000 kilometre wide, block faulted regions of sparsely sedimented, basaltic seafloor raised 2-3 kilometres above the regional abyssal plains
• D)50-200 metre-wide rough mounds of metal sulphides that encircle the globe continuously for more than 70,000 kilometres

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