Seamount groups and submarine ridges (SMTs and SRs)
Seamounts are basaltic volcanoes which rise from the ocean-floor. They form submarine peaks or, if they have been eroded by marine action, they are flat-topped (guyots). These mounts may occur singly or in groups, or even in linear chains, and are not usually related, either by time or space, to continental break-up.
Submarine ridges, which are of wholly marine origin, are elongated features with relatively steep sides, and commonly exhibit marked topographical variations. They may be created either on or off the axis of spreading. Those that are related to the axis of spreading may span the ocean, cf. the Greenland-Icelandic-Faroes feature in the N Atlantic and the complex ridge that spreads in opposite directions from Tristan de Cunha. However, some submarine ridges (e.g. the Hawaiian-Emperor chain) are remote from any spreading-ridge.
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