Contents of 12.3 What is the evidence that plates move apart at divergent plate boundaries?

Image of freshly cooled lava flow along an ocean ridge

12.3 What is the evidence that plates move apart at divergent plate boundaries?

Fig 12.10

A freshly-cooled submarine lava flow along an ocean ridge

Approximately 18 cubic kilometers of basalt erupt along Earth's ocean ridges in any given year.