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| magma which is extruded from volcanoes and fissures at the earths surface |
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| fragmental volcanic material which has been blown into the atmosphere by explosive activity |
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Definition
| hydrogen sulfide, sulfur dioxide, carbon dioxide, hydrochloric acid, steam |
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| the internal property of a substance that offers resistance to flow |
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Definition
can travel a long distance before it cools and solidifies
gases can escape from the magma as it reaches the surface |
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Definition
can only travel a short distance before it cools and solidifies
the upward passage of gases are blocked by highly viscous magma
blocked passage builds up pressure till eruption results |
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Term
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Definition
-most common type of presently active volcano -also known as stratovolcanoes
-volume of pyroclastic material usually exceeds the volume of lava |
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