Indian Pebble & Cobble
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A pebble is a clast of rock with a particle size of 2 to 64 millimetres based on the Krumbein phi scale of sedimentology. Pebbles are generally considered to be larger than granules (2 to 4 millimetres diameter) and smaller than cobbles (64 to 256 millimetres diameter). Pebbles are found in two locations on the beaches of various oceans and seas, and inland where ancient seas used to cover the land. When then the seas retreated, the rocks became landlocked. They can also be found in lakes and ponds. Pebbles can also form in rivers, and travel into estuaries where the smoothing continues in the sea.

Pebbles come in various colors and textures, and can have streaks of quartz and different colored sedimentary rock. Pebbles are mostly smooth but, dependent on how frequently they come in contact with the sea, they can have marks of contact with other rocks or other pebbles. Pebbles left above the high water mark may have growths of organisms such as lichen on them, signifying the lack of contact with seawater. Beach pebbles and river pebbles (also known as river rock) are distinct in their geological formation and appearance.

Inland pebbles (river pebbles of river rock) are usually found along the shores of large rivers and lakes. These pebbles are formed as the flowing water washes over rock particles on the bottom and along the shores of the river. The smoothness and color of river pebbles depends on several factors, such as the composition of the soil of the river banks, the chemical characteristics of the water, and the speed of the current. Because river current is gentler than the ocean waves, river pebbles are usually not as smooth as beach pebbles. The most common colors of river rock are black, grey, green, brown and white.

Cobblestones are stones that were frequently used in the pavement of early streets. Cobblestones are typically either set in sand or similar material, or are bound together with mortar. Paving with cobblestones allows a road to be heavily used all year long. It prevents the build-up of ruts often found in dirt roads. It has the additional advantage of not getting muddy in wet weather or dusty in dry weather. Cobblestones set in sand have the environmental advantage of being permeable paving, and of moving rather than cracking with movements in the ground.
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