What part of the river will have the greatest removal of regolith?

The greatest removal are Headward erosion is erosion at the origin of a stream channel, which causes the origin to move back away from the route of the stream flow, and so causes the stream channel to lengthen. It is the process by which a river erodes its source region, apparently lengthening its channel in a direction opposite to that of flow.

air, water, heat and noise pollution can all be caused by producing and using technology. consuming resources - non-renewable resources, including precious metals like gold, are used to make technology