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 A volcano is formed by eruptions of lava and ash. 2  Volcanoes are usually cone shaped mountains or hills. 3  When magma [magma: Magma is molten rock. ] 4  reaches the Earth's surface it is called lava. ] reaches the Earth's surface it is called lava. 2  When the lava cools, it forms rock. 3  Volcanic eruptions can happen at destructive [destructive boundaries: The boundary of two plates which are moving towards each other.