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.
1. Figure 5.1: Often, rising magmas reach the surface and erupts as lava or pyroclastics. A volcano is a hill or mountain that forms from the accumulation of material that erupts at the surface. 2. Volcanic eruptions are often devastating and have destroyed many lives and property throughout recorded history.