i understand that shore is a narrow land strip joining the sea, what is beach then?

The shore is the general term for the area where the tide meets the land. This could be a cliff-face for inatance, where there is no beach. A beach is a predominantly flat area of sand, shale or shingle (pebbles) which is partially covered at high tide.
A beach is made of sand. A shore can be made of rocks, sand, dirt or it can even be a cliff. So a beach is a type of shore.

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A shore or shoreline is the fringe of land at the edge of a large body of water, such as an ocean, sea, or lake.
In Physical Oceanography a shore is the wider fringe that is geologically modified by the action of the body of water past and present, while the beach is at the edge of the shore, representing the intertidal zone where there is one.
In contrast to a coast, a shore can border any body of water, while the coast must border an ocean; that is, a coast is a type of shore. Shore is often substituted for coast where an oceanic shore is meant.

Shores are influenced by the topography of the surrounding landscape, as well as by water induced erosion, such as waves. The geological composition of rock and soil dictates the type of shore which is created.

source:http://en.wikipedia.org/wiki/Shore


A beach is a geological landform along the shoreline of an ocean, sea or lake. It usually consists of loose particles which are often composed of rock, such as sand, gravel, shingle, pebbles, waves or cobblestones. The particles of which the beach is composed can sometimes instead have biological origins, such as shell fragments or coralline algae fragments.

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