Christopher Columbusâ Discovery of the New World. One of the most famous explorers in the world, Christopher Columbus was born in Genoa, Italy in 1451. Columbus grew up helping his father at his cheese stand. In 1470 the family moved to Savona and later that same year he became a seaman in the Portuguese merchant marine.
A volcano is a vent or chimney which transfers molten rock known as magma from depth to the Earth's surface.Magma erupting from a volcano is called lava and is the material which builds up the cone surrounding the vent. A volcano is active if it is erupting lava, releasing gas or generates seismic activity.agma erupting from a volcano is called lava and is the material which builds up the cone surrounding the vent. A volcano is active if it is erupting lava, releasing gas or generates seismic activity.
Noun. 1. volcano-a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt. vent. crack, scissure, cleft, crevice, fissure-a long narrow opening.eructation, extravasation, eruption - (of volcanos) pouring out fumes or lava (or a deposit so formed).n opening in the earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption. b. A similar opening on the surface of another celestial object. 2. A usually cone-shaped mountain formed from the materials issuing from such an opening.