Discussion
The heights and widths of the mid-oceanic ridges with reference to the abyssal plane is of the order :
Answer: B
Mid-ocean ridges stand about 2.5 km above the abyssal plain and are about 3000 km wide.
The ridge crest typically lies at about 2.5 km depth, while the abyssal plains on either side lie at about 5 km, so the ridge rises some 2-3 km. Its flanks slope down gently over great distances, giving a total width of the order of 1000-4000 km; the Mid-Atlantic Ridge occupies roughly the middle third of the Atlantic.
A height of 6 km is too great and a width of 500 km too narrow, and 3000 km is a width, not a height, so the other options are wrong.
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