GEOLOGY

Detailed explanation-1: -1 Volcanoes 82A Genre: Nonfiction: Expository nonfiction selection on volcanoes.

Detailed explanation-2: -A volcano is a form of land, usually a mountain, where molten rock erupts and comes through to the surface of the Earth. It usually looks like a mountain where the top is open, leading to a pool of magma below the Earth’s surface.

Detailed explanation-3: -Volcanoes are classified as active, dormant, or extinct. Active volcanoes have a recent history of eruptions; they are likely to erupt again. Dormant volcanoes have not erupted for a very long time but may erupt at a future time. Extinct volcanoes are not expected to erupt in the future.

Detailed explanation-4: -Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers. Eventually, some of the magma pushes through vents and fissures to the Earth’s surface.

Detailed explanation-5: -The six eruption types are in order from least explosive to the most explosive; Icelandic, Hawaiian, Strombolian, Vulcanian, Pelean, and Plinian.