The name Angela is a French baby name. In French the meaning of the name Angela is: Angel. Spanish Meaning: The name Angela is a Spanish baby name. In Spanish the meaning of the name Angela is: Angel.he name Angela is a French baby name. In French the meaning of the name Angela is: Angel. Spanish Meaning: The name Angela is a Spanish baby name. In Spanish the meaning of the name Angela is: Angel.
âA trough is an elongated area of low atmospheric pressure that can occur either at the Earth's surface or at higher altitudes.â âIn southwestern Australia, the hottest conditions are normally associated with low pressure troughs that direct east to northeasterly winds from the hot interior.â
Crests and troughs. Waves have moving crests (or peaks) and troughs. A crest is the highest point the medium rises to and a trough is the lowest point the medium sinks to. Crests and troughs on a transverse wave are shown in Figure 1. A crest is a point on the wave where the displacement of the medium is at a maximum.