What change will a pebble usually undergo when it is transported a great distance by streams?
Answer (2)
When a pebble is transported a great distance by streams, it typically undergoes physical changes. Due to the processes of erosion and deposition, the pebble will become more rounded and smooth as it rubs against other rocks and sediments in the flowing water.
This physical weathering happens through mechanisms such as traction, where pebbles roll or drag along the stream bed, and saltation, where particles move in little jumps near the bottom nudged along by water and other particles. Over time, the pebble may break down into smaller pieces due to the mechanical forces it encounters.
As the stream's velocity decreases, it deposits larger sediments like pebbles, especially when the water no longer has the energy to carry them. These processes contribute to the gradual change in the shape, size, and appearance of the pebble as it is transported by the stream.
A pebble transported by streams usually becomes more rounded and smooth due to the processes of erosion and deposition. This change occurs as the pebble collides with other materials in the water, leading to a reduction in size and a smoothing of its surface. The main mechanisms of movement are traction and saltation, which influence how pebbles are carried and eventually deposited.
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