Shorelines are temporary, geologic and topographic features. Explain?

Question

Shorelines are temporary, geologic and topographic features. Explain?

Answer 1

If there is a fundamental of geology that I wish I could tell everyone in the world, this is the one.  

Shorelines are about as impermanent feature in geological terms as any, because the water is always in motion, battering against the shore, slowly wearing it away.  The materials in the near shore environment (sand, silt, clay) are constantly being moved around by wave and current activity.

The shoreline is the line of battle in the process of erosion.  It is an area of constant activity.

Answer 2

Shorelines are temporary features because they can be changed by agents of erosion---mainly water.

Shorelines are geological features because the bedrock composing rocky shorelines was formed millions of years ago by geologic processes. Glaciers played a large role in sculpting this rock to its present form. They formed fiords and U-shaped valleys, scoured away sediment from some locations and deposited it in others.

Shorelines are topographic features because they are surface features of a place or region on a map.