plate tectonics

1. Compare the age of igneous rock found near the mid-ocean ridge with that of igneous rock found farther away from the ridge. The ages of the igneous rock found near the mid-ocean ridge was younger than the igneous rock found farther away from the ridge. This is because of convection currents. Magma rises because it is less dense. It is forced out of the ridge, it spreads apart, and when it cools, it becomes new seafloor. This is why newer seafloor (igneous rock) is younger when it is closer to the ridge.
2. 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. That point in Africa was at or near the Mid-Atlantic Ridge 192 million years ago. I got this answer because I know that the movement of the seafloor is about 1.25 cm per year. I converted 2,400 km in to 240,000,000 cm. Then I divided 240,000,000 by 1.25, and I got 192 million years.
3. How could you use this method to reconstruct Pangaea? I could use this method to reconstruct Pangaea. I could do this by calculating the distance of each of the continents from the Mid-Atlantic Ridge. Then I could convert the distance to cm, and divide that distance by 1.25 cm. This would tell me how long ago Pangaea was on the Mid-Atlantic Ridge. I would also be able visualize or reconstruct it.

Work:
(Estimated because of chart)
Peaks (age in millions of years) -
1: East-2.5 West-3.5
2: East-4 West- 4.75
3: East-6.25 West-7
4: East-7.5 West-8.5
5: East-9 West-10
6: East-11.5 West-11.5
Peaks (km) -
1: East-32 West-40
2: East-54 West- 59
3: East-78 West-81
4: East-97.5 West-112
5: East-118 West-125
6: East-144 West-145