This is when waves in the sea crash against sea walls, for example, over a long period of time. Eventually there will be marks on the sea walls and this is called wave scouring.
Concave
There are some meaning on the term " concave up". However, in most cases, a concave is a hallow curve. A half circle with an opening is also a concave. Concave up means to concave somethings.
The mold for a concave object is convex.The mold for a convex object is concave.
concave
The surface is concave if the liquid is attracted to the container walls and convex if it is not
because the point of origin would be on an outer point and around it the walls seem to cave in making it seem concave, in comparison to a regular polygon. When checking for concave polygons always compare what you are looking at to a regular polygon
Male sea turtles usually have more concave shells and longer tails
By waves smashing against the sea walls
This is when waves in the sea crash against sea walls, for example, over a long period of time. Eventually there will be marks on the sea walls and this is called wave scouring.
Tafoni are small cave-like features found in granular rock such as sandstone, with rounded entrances and smooth concave walls.
Groynes, columns of boulders and sea walls are the most popular ones. sea walls are the most expensive, costing about 700,000 pounds per metre!
Sea walls.
These walls are called dykes or dams. (dijken in Dutch)
concave
Most sea walls consist of concrete or natural stone.
Groynes, sea walls and rip-raps