19. find the south american plate, the african pla boundary between them. what happens to mid-atlantic ridge? chican plate, the african plate, and the mid-atlantic ridge that marks the on them. what happens to the age of the seafloor as distance increases away from the • is crust being created or do crust being created or destroyed at this plate boundary and other spreading ridges)? • is this plate boundary divergent, convergent, or transform?