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).
These pink stony crusts are found in sunlit parts of the seafloor from the poles to the tropics, and collectively are called crustose coralline algae. Crustose coralline algae play a variety of important roles in many marine ecosystems, particularly coral reefs. We call them coral reefs because their three-dimensional structures are built by stony coral animals, which produce limestone as they grow ever upwards towards the sun. Corals may create the major structuresâthe bricks of the reef, if you willâbut no brick wall will stand strong without cement. Enter our unassuming friends the crustose coralline algae. They grow as a crust over ...