transform boundaries: 2 plates slide past each other.
divergent boundaries: when plates are moving apart from a point.
convergent boundaries: 2 plates come together/join at a point.
The plates move by diverging or converging by their Boundrys.
As the Atlantic Ocean gets bigger, the Pacific gets smaller.
Trenches are recycled by land. And Crusts are connected which causes continents to enlarge.
I had the south American plate, that plate has a Huge Trench in the East alantic Ocean.
It has lots of cluster Volcanos on the south end, and some mountians but not huge ones !
<img src="http://i281.photobucket.com/albums/kk237/misshan123/350px-Plates_tect2_ensvg.png" border="0" alt="">