1 A review of research involving human subjects by the IRB chair or by one or more experienced reviewers designated by the chair from among members of the IRB in accordance with the requirements set forth in 45 CFR 46.110. 2  Experimental subject (as defined by Department of Defense, or DOD).
Anvil clouds are the icy upper portions of cumulonimbus thunderstorm clouds that are caused by a rising of air in the lower portions of the atmosphere. When the rising air reaches 40,000-60,000 or more feet, it tends to spread out in a characteristic anvil shape.
Altocumulus castellanus is classified under altocumulus clouds. This cloud species is named for its tower-like structure that develops from the main cloud deck akin to prehistoric castles. The dynamic towers of altocumulus castellanus clouds indicate unstable air at mid-atmospheric level due to an upcoming storm. Altocumulus castellanus appear anywhere between 2,000 and 6,000 meters (or 6,500 to 20,000 feet) above the Earthâs surface.