what is a volcano for children

introduction to volcanoesWhy do volcanoes eruptKinds of volcanoesTypes of volcano eruptionVolcanic eruptions in the seaParts of a volcanoEffects of a volcanoimportant volcano words




Common types of volcanoes

Now, let us see the four common types of volcanoes: Shield volcano and lava domes, cinder cones and composite volcanoes.

volcano factShield Volcanoes
This is very fluid lava, usually from multiple vents or fractures, spreading over very large areas. The fluid-like nature (viscous – say veez-kos) of the lava, it does not allow it to pile up like a cone. The result is usually an elevation with a shape like a warrior’s shield. Mount Kilauea and Maunaloa in Hawaii are good examples of shield volcanoes. They are usually found at constructive or tensional boundaries.

what is a shield volcano
volcano factLava Domes
They are produced from eruptions with less viscous lava. Because it is less viscous, they do not spread far and cool off (hardens) sooner. This means they pile around the vent and the dome grows only because of the expansion of the vent area within. Lava domes tend to have steep walls and rock types such as andesites, dacites or rhyolites (say rai-o-lites)

volcano fact
Cinder Cones
These are the most common in the study of volcanoes. When lava is ejected into the air above, the fragments and fine particles fall as cinders (ash) around the vent, forming a cone. The height of cinder cones usually depend on how long the eruption takes and how much lava comes out. The cone has a depression (crater) in the middle where the vent is. Cinder cones can rise as high as 1200ft. A good example of a cinder cone is the Paricutin Volcano in Mexico.

cinder cone and composite volcano

volcano factComposite Volcanoes
These are usually awesome in nature, rising up to about 8000ft. They are also known as stratovolcanoes and they include Mount Cotopaxi in Ecuador and Mount Fuji in Japan. They are seen as massive mountains. They are formed by alternating layers of ash, rock, dust and lava, (pyroclastic) and hence the name ‘composite’.  They have steep slopes with a peak.

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