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.
A volcano is an opening in the Earths surface through which lava, hot gasses, and rock fragments erupt. This kind of opening forms when melted rocks deep within the earth blasts through the surface.Most volcanoes are mountains, particularly cone-shaped one, are built up around the opening by lava and other materials thrown out during eruption.he lava gradually builds up a low, broad dome shaped mountain. The famous Mauna Loa in Hawaii is a shield volcano. Thousands of separate, over lapping lava flows, each less then 50 ft thick, formed Mauna Loa. This picture demonstrates the shield volcano.