rifting  search
RTaccommodation zones
 accreting plate boundary
 accretion
 extension tectonics
 median valley
 oceanization
 passive margins
 plate boundaries
 plate divergence
 plate tectonics
 rift zones
 sea-floor spreading
 submarine volcanoes
 suture zones
 taphrogeny
 tesserae
 und
SNAs of 1993, also search accreting plate boundary and plate boundaries if applicable.