Subspecies. 1  H. c. charithonia, Ecuador. 2  H. c. simulator, Jamaica. 3  H. c. bassleri, Colombia. 4  H. c. churchi, Haiti. 5  H. c. tuckeri, Florida. 6  H. c. vazquezae, Mexico. 7  H. c. ramsdeni, Cuba. 8  H. c. antiquus, St. Kitts, Antigua.
See also: Convection. In the field of fluid dynamics, a convection cell is the phenomenon that occurs when density differences exist within a body of liquid or gas.These density differences result in rising and/or falling currents, which are the key characteristics of a convection cell.ee also: Convection. In the field of fluid dynamics, a convection cell is the phenomenon that occurs when density differences exist within a body of liquid or gas.
The depressurization and the escape of gas from a beverage is the same process that occurs when magma is depressurized as it emerges from a volcanic vent. The foam is equivalent to what will become scoria on solidification. A vesicular igneous rock that is very similar to scoria is pumice. There are a few differences that can be used to distinguish them. First is their color. Scoria is almost always black or dark gray to reddish brown while pumice is almost always white to light gray to light tan.