Referring to the diagrams to the right, rift valleys are formed by tension between two roughly parallel faults (A), causing downward earth movement resulting in the formation of a graben (trough of land between two faults). Sometimes a number of parallel faults results in land sinking in steps (B). A typical example of a step-faulted rift valley is shown (C). A series of block faults can occur on either side of a graben, sometimes tilting in the process of creating the block-faulted rift valley.
Related categories GEOGRAPHY
• GEOLOGY AND PLANETARY SCIENCE
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