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.
Facts About. Chromosphere. The chromosphere is a structure composed of warm gas that is above the visible surface of the sun and most stars, which is called photosphere. It is transparent in visible light but bright and opaque in strong lines of elements such as hydrogen, helium, calcium and oxygen. It is about 6,000 miles thick.