The nature of a volcanic eruption is determined by the temperature, viscosity and the amount of dissolved gases in the magma, according to San Diego State University. These factors determine whether an eruption is calm a... More »

A limnic eruption, which is sometimes known as a lake overturn, is a rare but deadly type of natural disaster that occurs when large amounts of dissolved carbon dioxide erupt from deep lake waters, suffocating livestock,... More »

Volcanic mountains form as lava oozes forth from cracks in the earth. The lava builds up around the area where the eruption occurred. Layers build upon layers and over a period of time, a volcanic mountain forms. More »

According to the United States Geological Survey, before a volcanic eruption, magma must travel upwards through rock. The travelling magma produces these precursors to an eruption: an increase in earthquakes beneath a vo... More »

A volcanic eruption is caused by the injection of magma into a full magma chamber, the buoyancy of magma and the pressure exerted by the gases in the magma. The volcano simply acts as an opening through which magma and d... More » Science Earth Science Volcanoes

Side vents, also known as secondary vents, in a volcano allow some of the magma and gases to escape but are not the main vent where the eruption takes place. One of the volcano's most recognized characteristic is the cra... More »

Various factors trigger a volcanic eruption. The three predominant factors are the magma's buoyancy, the pressure from the gases that separate in the magma and the merger of a new batch of magma with a chamber already fi... More »