The chain runs down the middle of the Atlantic Ocean (surfacing ... It then solidifies into rock as it is cooled by the sea, creating new ocean floor. The speed at which new ocean floor is created ...

For more on divergent boundary, go to The Sea Floor Spread. Also known as subduction boundary, a convergent boundary occurs where one plate slides under another as the two are pushed together.

The tiny Juan de Fuca plate is largely responsible ... creates three types of tectonic boundaries: convergent, where plates move into one another; divergent, where plates move apart; and transform ...