Which of the following is associated with a fast-spreading ridge?

A) rates of about 10 centimeters per year or more
B) a broad ridge because the rocks remain hotter farther from the center of spreading
C) less of a deep central rift than in a slow spreading ridge
D) all of these

Fast-spreading ridges are characterized by higher spreading rates (about 10 cm/year or more), a broader morphology due to the prolonged cooling of rocks farther from the spreading center, and a less pronounced central rift compared to slow-spreading ridges. These features collectively describe the geological and physical differences between fast and slow-spreading ridges.