Question
Headward erosion and Lateral erosion.
| Headward erosion | Lateral erosion |
| (i) Headward erosion is the backward erosion by river in the source region. | (i) Lateral erosion is the erosion that occurs on the sides of valleys of a river or glacier. |
| (ii) This is carried away by the river. | (ii) The valley slopes are eroded by tributary streams. |
| (iii) Headward erosion causes the river to move backward, because erosion takes place in the opposite direction of the follow of river. | (iii) Lateral erosion causes widening of valley, because lateral erosion occurs in the valley sides. |
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