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the pebbles will be in the lower course of a riverthe pebbles will be in the lower course of a river
The river valley becomes flat in its lower course due to the levels of erosion occurring in the river itself. In the upper course, the river's energy is used for vertical erosion(downward erosion) in order to get to sea level. That's why you see steep V-shaped valleys or Gorges being formed. However, in the lower course when the river is at sea level, a lot of this erosion becomes lateral(horizontal) which is why you see rivers becoming a lot wider in the lower course. Therefore, because the river is no longer eroding downwards there's no longer a difference in height between it and its valley, so the river valley becomes flat.
the upper course, closest to the mountains and hills; the middle course, between the upper and lower courses; the lower course, the flattest area close to the sea.
middle course, upper course, lower course...
The mouth of the River Tees is at the North Sea. The lower course of the River Tees goes through Redcar near Middlesbrough.
Yangzi River.
A river usually flows quickly in the upper course, as it is at a higher elevation - mountains streams, waterfalls, etc. In the lower course, it will slow down as the lower elevation means the slope is more horizontal. It is here that the river may start to meander across the valley floor, forming bends, oxbow lakes, and a flood plain.
The lower course flows through Egypt, into the Nile delta where it divides into two distributaries, the Damietta to the east and the Rosetta on the western part of the delta. It then flows into the Mediterranean Sea.
what is a river process ? A river process consists of three 1.erosion (in the upper course) 2.transportation(in the middle course) and 3.deposition (in the lower course).
The difference is width
Fairly slow
The upper, lower and middle course.