The map below shows a portion of the North Atlantic Ocean, with the Mid-Atlantic

Question

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

1. Is this ocean expanding or contracting? What is the evidence?

2. At what rate is Africa moving away from or toward North America?

Location Distance from Ridge Age of Sea Floor Rate of Movement (km) (my) (km/my) A B C D E North America 0 500 1000 1500 Europe Scale (km) Ridge 35 156 / 118 118 84 55 35255 84 156 EAfrica

Explanation / Answer

Answer:

Here, as per scale, 500 km = 1.07 cm. Assuming this, we can measure every distance.

Location Distance from the ridge (km) Age of sea floor (my) Rate of movement (km/my) A 467 35 13.34*10-6 B 934.5 84 11.12*10-6 C 1635.5 118 13.86*10-6 D 2336 156 14.97*10-6 E 1869 156 11.98*10-6

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