Volcanoes

by sahiramelo
Last updated 9 years ago

Discipline:
Science
Subject:
Earth Sciences

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Volcanoes

Lava domes They are formed by relatively small, bulbous masses of lava too viscous to flow any great distance; consequently, on extrusion, the lava piles over and around its vent. A dome grows largely by expansion from within. As it grows its outer surface cools and hardens, then shatters, spilling loose fragments down its sides.

Composite VolcanoesThey have some very violent explosives. They are large, but not as big as shield volcanoes. The are often called stratovolcanoes, they form slowly over thousands of years. They are formed by the expansion of slow-moving lava flows, ash, and volcanic matter. Magma flows to the surface through a vent-like circulation system.

Volcanoes

Shield VolcanoesThey're the largest. They produce thin lava flows, which can travel miles from an erupting vent without cooling. They're made of solid layers of lava. They slope in the shape of a flattened dome.

Cinder Cone VolcanoThey erupt frequently, which means they produce low-viscous lava. There are steep hills surrouiding it's volcanic vent, which is where the lava is released. They are the simplest and most common volcano of them all. They are made up of glassy rock fragments called scoria.

All VolcanoesThey all produce they produce lava, steam, and hot gases.


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