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izkid222
Freeze thaw occurs on the mountain creating large chunks of rock which progress down stream. However a more logical answer would be calving,abrasion and plucking that are processes performed by a glacier removing peices of rock from the mountains. As these melt they form streams, large rocks and boulders would be left behind.
Lanuel

A landform can be defined as a geomorphic or natural feature of the Earth's surface, which typically make up its terrain.

Some examples of landforms on planet Earth include the following:

  • Plains.
  • Valley.
  • Hills.
  • Plateau.
  • Mountain.

A mountain stream can be defined as a stream or brook that usually has a steep gradient and flows down through the side of a mountain (mountainside).

A boulder refers to a large rounded mass of rock fragment that is formed through its detachment from a parent consolidated rock, especially due to erosion and weathering.

Basically, the size of a boulder is greater than 256 millimeters (25.6 centimeters or 10.1 inches) in diameter.

Generally, the reason why large boulders are present in steep mountain streams is because they are usually too heavy to be moved by the stream (water).

This ultimately implies that, water cannot move any large boulder that is present in steep mountain streams because of its size and weight.

Read more: https://brainly.com/question/22432773

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