Compare the age of igneous rock found near the mid-ocean ridge in the graph or model and igneous rock found farther away from the ridge. How does this support the Theory of Seafloor Spreading? How does this support the reason for little or no sediment on mid-ocean ridges?

If the distance from a point on the coast of Africa to the mid-Atlantic Ridge is approximately 2,400 km, calculate how long ago that point in Africa was at or near the Mid-Atlantic Ridge.

How can the clues about the Earth?s magnetic field reversals recorded east and west of the mid-ocean ridge be used to support sea-floor spreading?

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West East 1 Normal polarity 2 5 4 6 3 Reverse polarity 125 150 100 75 50 25 25 75 100 50 125 150 Distance (km) 12 8 10 2 4 6 8 5 | 7 10 12 6. 2 1 | 3 9 11 Age (millions of years) Mid-Atlantic Ridges West East 1 Normal polarity 2 5 4 6 3 Reverse polarity 125 150 100 75 50 25 25 75 100 50 125 150 Distance (km) 12 8 10 2 4 6 8 5 | 7 10 12 6. 2 1 | 3 9 11 Age (millions of years) Mid-Atlantic Ridges