The water falls from a height of 22 meters creating a scenic surroundings around it. Waterfalls are commonly formed in the upper course of the river. At these times the channel is often narrow and deep. When the river courses over resistant bedrock, erosion happens slowly, while downstream the erosion occurs more rapidly. As the watercourse increases its velocity at the edge of the waterfall, it plucks material from the riverbed. Whirlpools created in the turbulence as well as sand and stones carried by the watercourse increase the erosion capacity. This causes the waterfall to carve deeper into the bed and to recede upstream. Often over time, the waterfall will recede back to form a canyon or gorge downstream as it recedes upstream, and it will carve deeper into the ridge above it. The rate of retreat for a waterfall can be as high as one and half meters per year. * WIKI (https://en.wikipedia.org/wiki/Waterfall)
Waterfalls form where a river bed crosses from hard rock to softer rock. The river wears down the softer rock and creates a step. The falling water erodes a hollow at the base called a plunge pool. Spray from the waterfall may under-cut the step and eventually cause it to collapse. Over time, the waterfall may cut back into the hard rock, leaving a steep valley called a gorge.
To log this cache, send to us via profile e-mail the answers to the questions a) – d)
Estimate (in meters):
a) The wideness of the widest part from the waterfall
b) The deepness from the plunge pool.
Concerning picture 3:
c) Have a look at the big rocks at the plunge pool. What do you think about them, are they rather weak rocks (and will disappear soon) or resistant rocks?
d) Consider the situation: did these rocks appear by natural erosion from the origin or have they been placed by human and why do think so?
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Team 3Koenige