Chairs = common noun; Roll-O-Rocker = proper noun. Harriet threw the stale cucumber sandwich in the trash can and fantasized about a Big Mac dripping with special sauce. Sandwich = common noun; Big Mac = proper noun. Because we like an attentive waiter, we always ask for Simon when we eat at Mama Rizzoli's Pizzeria.
Answer: Reef Sand is live sand when it is on the bottom of the ocean floor, it is here where the reef sand is alive. When the Reef Sand has been out of the seawater for a period of time and exposed to the airborne elements it is considered to be dead sand. (lacking nitrifying bacteria).
Cold-water coral reefs, also known as deep ocean reefs, are found from Norway to the Aleutian Islands. There are three kinds of coral reefs: fringing reefs, barrier reefs, and atolls. A fringing reef forms along the edge of a coast and is attached to land. It extends outward from shore like a shelf, just below the surface of the water. A fringing reef is composed of a reef flat and a reef slope.