Here are some of the most common types of eruptions: In a Hawaiian eruption, fluid basaltic lava is thrown into the air in jets from a vent or line of vents (a fissure) at the summit or on the flank of a volcano.
The underscore sign is mainly used to show a space where a space is not allowed, such as in internet usernames, email addresses and some computer programs. The underscore looks like a dash below the letters (_).
Webster's: preliminary painting; especially: such painting done on a canvas or panel and covered completely or partially by the final layers of paint. In other words, the Underpainting is the first coating of oil on the canvas. This process becomes a roadmap to the execution of a painting.