MCQOPTIONS
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| 1. |
Formation of a rift valley is due to.... |
| A. | the over-deepening of a valley by ice action |
| B. | the formation of fold mountains |
| C. | the forces of tension in the earth's crust |
| D. | the subsidence of the floor of a river valley |
| Answer» D. the subsidence of the floor of a river valley | |