What are the different types of volcanoes?
Volcanoes are grouped into four types: cinder cones, composite volcanoes, shield volcanoes and lava volcanoes.
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WHAT'S INSIDE?MAGMA - Magma is the liquid rock inside a volcano. LAVA - Lava is the liquid rock (magma) that flows out of a volcano. Lava glows red to white as it flows. ACTIVE VOLCANO - An active volcano is one that erupts regularly. DORMANT VOLCANO - A dormant volcano is one that has not erupted for many years, although there is still some activity deep inside. EXTINCT VOLCANO - An extinct volcano is a volcano that is no longer active. GEYSERS - Geysers are springs that throw boiling water high in the air. They are caused by volcanic heat warming trapped ground water. ASH - Ash are very small fragments of lava or rock blasted into the air by volcanic explosions. PUMICE - It is a light-colored volcanic rock containing lots of bubbles from trapped gases. |
IS IT ALVE?
ACTIVE VOLCANO -
An active volcano is one that erupts regularly. DORMANT VOLCANO - A dormant is one that has not erupted for many years, although there is still some activity deep inside. EXTINCT VOLCANO - An extinct volcano is a volcano that is no longer active. What is a super volcano? A super volcano is the most destructive force on this planet. Only a few exist in the world and when they erupt they do so with a force tens of thousands of times greater than other eruptions. They lie dormant for hundreds of thousands of years as a vast reservoir of magma builds up inside them before finally they unleash their horrific force, capable of obliterating continents. They threaten the survival of mankind. |
The last eruption of a super volcano was in Toba, Sumatra, 75,000 years ago. It had 10,000 times the explosive force of Mount St. Helens and changed life on Earth forever. Thousands of cubic kilometres of ash was thrown into the atmosphere - so much that it blocked out light from the sun all over the world. 2,500 miles away 35 centimetres of ash coated the ground. Global temperatures plummeted by 21 degrees. The rain would have been so poisoned by the gasses that it would have turned black and strongly acidic. Man was pushed to the edge of extinction, the population forced down to just a couple of thousand. Three quarters of all plants in the northern hemisphere were killed. |