Erta Ale is a remote and rarely visited volcano that is known currently to have an active lava lake in its summit crater. Erta Ale has undergone seven eruption events in the past 125 years.
Re: What are the differences between Signal ground, Chasis ground and Earth?? Signal Ground is a reference point from which that signal is measured, due to the inevitable voltage drops when current flows within a circuit, some 'ground' points will be slightly different to others. There may be several signal grounds in a circuit.
A grounded system is a system in which one of the current-carrying conductors is grounded. An  equipment grounding conductor  is a conductor that does not normally carry current (except under fault conditions) and is also connected to earth.n some areas, the term earthing is used instead of grounding. A  grounded conductor  is a current-carrying conductor that normally carries current and is also connected to earth. Examples are the neutral conductor in AC wiring and the negative conductor in many DC systems.