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| volcano is a weak spot is the earth where multen of material or magma rises to the surface |
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| Magma is Moulton mixture of rock forming substances gases and water from the mantle |
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| when magma reaches the surface it is called lava |
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| one of the major volcanic belt is the Ring of fire formed volcanoes that rim the Pacific Ocean |
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Magma
eventually breaks through the ocean floor creating volcanoes the resulting volcanoes create a string islands called off island arc |
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| a hotspot is an area where material from deep within the mantle Rises and the belts forming magma |
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| Below a volcanoe magma colects in a pocket called a magma chamber |
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| A pipe is where the magma goes through and reaches the crust |
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| Vents are often at the top of volcanoes |
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| A lava flow is the area covered by lava as it pours out of a vent |
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| A crater is a boul shaped are at the topp of a volcanoe around the centrall vent |
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It ia a type of eruption were it hurls out a mixture of gasse ash cinders and bombs
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| Dormant means that a volcanoe might erupt in the near future |
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| A volcanoe will most likely never erupt again |
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| A gyeser is a fountain of water and steam that erupts from the ground |
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| Beneath a volcano magma collects in apocket called a magma chamber |
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| Such lava gradualy build a wide gentle sloping mtn called a shield volcano |
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| These materials build up around the vent in a steep cone shaped hill or small mounten called a cinder cone |
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| Composite volcanoes are tall cone shaped mountains in which layers of lava alternate with layers of ash |
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| The huge hole left by the collapse of volcanic mountain is called a calldera the whole is filled with pieces of volcano that has fallen inward as well as some lava and Ash |
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| A volcanic neck forms when magma hardens in the volcanoes pipe |
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| Magma that forces itself across rock layers hardens into a Dyke |
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| When magma squeezes between horizontal rock layers it forms a sill |
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| intrusion forms when magma hardens underground to form igneous rock |
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| A batholith is a mass of rock formed when a large body of magma cools inside the crust |
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| A basin is a broad bowl shaped valley |
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| The central valley of California is a huge basin with the Sierras and coast ranges on either side |
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