Shingled beach
Beach pebbles are smooth as they are eroded by the waves
the pebbles at the front of the beach get eroded by the water
This process is known as beach erosion or sediment deposition, where waves bring in sand and pebbles and then drop them along the shore.
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That type of rock is called conglomerate. It is composed of rounded pebbles and sand grains that have been compacted and cemented together by mineral materials.
Lots of pebbles on the beach
pebbles
Beach = sand, pebbles etc. Sea = water.
Not many. A few hundred will do in a tiny rocky cove. The main feature of a pebble beach is not that there are many pebbles, but that there is no sand. If there is sand, it cannot be a pebble beach.
Sedimentary rock composed of older fragments of rock is called a conglomerate. This type of rock forms when pebbles and small stones are cemented together.
Pebbles are often found at the top of a beach because they are lighter and get washed up by waves and tides. The force of the water can carry the pebbles to the upper parts of the beach as it recedes. This process of wave action and erosion tends to concentrate smaller, lighter materials like pebbles at the higher points of a beach.