We have made models of two identical valleys. The first shows a relatively new river, that is flowing through a green valley. The river is very small and shallow. In the second model it shows the same river but a long time latter. The river has eroded the banks so the river a quite a bit wider, and the water has also made the river deeper.
Here is the vocab that we used on our models, and the meanings.
Meander- a loop or bend that occurs
oxbow lake- a meander cut off from a river
Tributary- a smaller river or stream that flows into a bigger river
Delta- where a river flow into the ocean leaving sediment
Beaches sand carried downstream by rivers spreads along coast
waterfall- a flat layer of tough rock lies over a layer of softer rock
Rills- as runoff travels tiny grooves in the soil
Gullies- a large groove or channel fueled by rill, that carries runoff after a rainstorm
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