AM E RICA Surroun ding most o f th e co n rme n rs a re ge mly slo p mg areas called co n rm enral sh elves , wh ich reac h depth s of a bo u t 650 ft. (200 m) . At th e edges of the connn cnral shelves lie steepe r connnental slopes lead m g down [0 th e de ep ocean basin, o r ab yss. The ab yss co n ta in s m any o f th e same features we see o n lan d , mcludmg p lains, moun tams ranges (rid ges), iso la ted mountains (k n own as sea mounts or guyots), and tr en ch es. The Mi d Ocean fudge syste m m arks th e ar eas wh ere crus ta l p lat es are movm g ap art , and is very ac tive geol ogICally, as m olten rock n ses a nd eru p ts [0 crea te new crust. Eart hq uakes an d volcanoes are common alo ng man y u n d ersea t renc hes a nd rid ges. ASIA A FR ICA
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