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).
The Worldâs 10 Largest Coral Reefs. Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. These corals are unable to move and clusters with other corals so they form colonies. Coral reefs vary in size, type and location and they are very sensitive organisms. They want clear and hot waters.