'This type of valley, like the "great" one in Africa, is bounded by parallel faults'
a rift
OTHER FAULT LINES: This type of valley, like the great one in Africa, is bounded by parallel faults
This type of valley, like the "great" one in Africa, is bounded by parallel faults
This type of valley, like the "great" one in Africa, is bounded by parallel faults
OTHER FAULT LINES
a rift
OTHER FAULT LINES