Pebbles are small, rounded stones that are typically found on beaches, riverbeds, and shorelines. They are formed by the erosion of larger rocks by water, ice, and wind. The process of erosion breaks down the rocks into smaller and smaller pieces, until they eventually become pebbles.

The shape of pebbles is determined by the type of rock that they are made of and the environment in which they are formed. Pebbles that are found on beaches are typically smooth and rounded, while those that are found in riverbeds are often more angular. This is because the waves on beaches act to smooth out the pebbles, while the water in rivers flows more quickly and does not have as much time to erode the rocks.

The color of pebbles can vary greatly, depending on the type of rock that they are made of. Pebbles can be white, black, brown, red, or any other color. Some pebbles are even translucent or semi-precious.

Pebbles are used for a variety of purposes, including landscaping, construction, and jewelry making. They can also be used for games, such as marbles or jacks.