The Ten Essential Public Health Services describe the public health activities that should be undertaken in all communities and were developed as a companion to the three core public health functions.
Live rock is rock from the ocean that has been introduced into a saltwater aquarium. Along with live sand, it confers to the closed marine system multiple benefits desired by the saltwater aquarium hobbyist.ase rock, or dry rock, is a generic term for aragonite rock that has no organisms growing in or on the rock. Base rock is often used as filler rock in the aquarium as it is much cheaper to purchase than live rock. In time, base rock will become colonized by living organisms.
In part this reflects to, historically, live bird shoots (which are typically the subject of protests) where the shooters would practice using live pigeons. The clay bird can also be referred to as blue rock which I believe was a trademarked term of the DuPont company. Since the games involving clays are shot by wingshooters (bird hunters) the shooters would refer to the clays as pigeons. It's not really a big deal what the clays are called, but it's a common term among the more avid shooters to refer to the clay today as a pigeon. Good luck.