opposite : 反対の、逆の

(位置が)『向こう側の』,反対側の,向かい合わせの / (動く方向が)反対の / (性質上)『正反対の』,相入れない / (…の)『正反対の人』(『物』),相入れないもの《+『of』+『名』》 / …に向かい合って
If at such a spreading contact the two plates support continents, a rift is formed that will gradually widen and become flooded by the sea. The Atlantic Ocean formed like this as the American and Afro-European plates move in opposite directions.