GEOLOGY

Detailed explanation-1: -The six eruption types are in order from least explosive to the most explosive; Icelandic, Hawaiian, Strombolian, Vulcanian, Pelean, and Plinian. Notice how, as the eruptions become more violent, the cone shapes become more steeply constructed.

Detailed explanation-2: -Several hazards may affect the area around the volcano, such as lava flows, pyroclastic flows, lahars, jökulhlaups and landslides or debris avalanches. Volcanic activity also produces hazards that can affect areas far from the volcano, such as tephra or ash falls, releases of gas and tsunamis.

Detailed explanation-3: -The list of hazards associated with volcanic eruptions is long and varied: lava flows, explosions, toxic gas clouds, ash falls, pyroclastic flows, avalanches, tsunamis, and mudflows.

Detailed explanation-4: -Ash Fall. Large quantities of ash produced during a volcanic eruption can be thick enough to collapse roofs, destroy vegetation and cause aircraft, ship and car engines to malfunction.