A river sometimes flows over a large step in the rocks

A river sometimes flows over a large step in the rocks

A river sometimes flows over a large step in the rocks that may have been formed by a fault line.

Waterfalls can occur along the edge of a glacial trough, where a stream or river flowing into a glacier continues to flow into a valley after the glacier has receded or melted

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A river sometimes flows over a large step in the rocks

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Streams can become wider and shallower just above waterfalls due to flowing over the rock shelf

Streams can become wider and shallower just above waterfalls due to flowing over the rock shelf

Streams can become wider and shallower just above waterfalls due to flowing over the rock shelf,

Known as a rock shelter under and behind the waterfall

Known as a rock shelter under and behind the waterfall

Often, the rock stratum just below the more resistant shelf will be of a softer type, meaning tha

Natural course of a water flow, and result in waterfalls

Natural course of a water flow, and result in waterfalls

In addition to gradual processes such as erosion, earth movement caused by earthquakes or landsli

Beauty of waterfalls

Beauty of waterfalls

As the watercourse increases its velocity at the edge of the waterfall, it may pluck material fro

Hydraulic jets and hydraulic jumps  below a waterfalls

Hydraulic jets and hydraulic jumps below a waterfalls

Hydraulic jets and hydraulic jumps at the toe of a falls can generate large forces to erode the b

Waterfalls are commonly formed in the upper course of a river in steep mountains

Waterfalls are commonly formed in the upper course of a river in steep mountains

Waterfalls are commonly formed in the upper course of a river in steep mountains.

Many waterfalls occur over bedrock fed by little contributing area

Many waterfalls occur over bedrock fed by little contributing area

Because of their landscape position, many waterfalls occur over bedrock fed by little contributin

Waterfall from the top

Waterfall from the top

The further downstream, the more perennial a waterfall can be.