The map below shows a portion of the north atlantic ocean, with the mid-atlantic ridge highlighted. dashed lines parallel to the ridge show the age of sea-floor basalt, in millions of years (my). complete the table for the locations indicated by letter, and answer the accompanying questions

location distance from ridge age of sea floor rate of movement
(km) (my) (km/my)
a
b
c
d
e
1. is this ocean expanding or contracting? what is the evidence?

2. at what rate is africa moving away from or toward north america?