This type of breakwater. has up to now been mainly used in Canada, Iceland, Norway and Denmark (Faero Islands). The main advan-. tage of the berm breakwater is that smaller stones can be. used on this dynamic stable berm breakwater than on a sta-. tic stable conventional rubble mound breakwater.
Click on image for larger version. The photosphere is the visible surface of the Sun that we are most familiar with. Since the Sun is a ball of gas, this is not a solid surface but is actually a layer about 100 km thick (very, very, thin compared to the 700,000 km radius of the Sun).ince the Sun is a ball of gas, this is not a solid surface but is actually a layer about 100 km thick (very, very, thin compared to the 700,000 km radius of the Sun).
What Is the Asthenosphere? The asthenosphere is part of the upper mantle located below the crust of the earth. The asthenosphere boundary is primarily defined by temperature, and it starts when the crust heats up to 1300Â° C. At this temperature the crust begins to melt and move more as a liquid. The asthenosphere is important in plate tectonics, as convection currents slowly move the tectonic plates that lie above.