Breakwater, artificial offshore structure protecting a harbour, anchorage, or marina basin from water waves. Breakwaters intercept longshore currents and tend to prevent beach erosion.
photosphere. luminous, apparently opaque layer of gases that forms the visible surface of the sun sun,intensely hot, self-luminous body of gases at the center of the solar system.
The photosphere of the Sun is like the crust of the Earth in some ways. Both the photosphere and the crust are many miles thick. The top of the crust is the surface of the Earth. If we could stand on the moon and look at the Earth, we would see it's surface -- its crust.