Sand bars are caused by the deposition of sand along a shoreline where waves and currents slow down and drop sediments. They can form at the mouths of rivers, along coastlines, or offshore in the ocean. Sand bars can change in shape and size due to wave action, tides, and storms.
sand bars
In the ocean. its a bar of sand in the ocean created by waves in the ocean.
Sand bars are located in rivers.
They are essential by definition. It is not possible to have a bar graph with no bars!
Yes
A loose pile of wind-blown sand.
Slides, swings, monkey bars, sand, and people you can play with
weathering
http://wiki.answers.com/Q/Where_are_most_sand_bars_on_an_old_age_river_located"
Horse seining
That would be called a Lagoon.