6th.Science ch,3
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| three common types of volcanoes are ___ ___ ___, ___ ___, and ___ ___ | cinder cone volcanoes, shield volcanoes, and composite volcanoes
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| a ___ ____ forms when large amounts of fluid, runny lava gradually build up a dome-shaped mountains | shield volcanoes
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| a typical shield volcanoes has a large_____, or depression, at its top | crater
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| a ___ __ ____ is formed by eruptions composed mostly of tephra, or small fragments of solidified lava (section 3.3)eruptions of volcanic solids build up ____-______ mountains | cinder cone volcanoes and cone-shaped
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| some volcanoes produce both cinders and lava, creating a cone and shield volcanoes such volcanoes are called ___ ___ | composite volcanoes
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| if a underground magma chamber of a volcano is close to the surface,the empty chamber may "cave in" after the eruption is over, causing the round to sink and forming a huge, bowl shaped depression at the surface. Such depression is called______ | calderas (kal da raz)
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| __________may later filled with rainwater to form large lakes | calderas (kal da raz)
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| one of the most beautiful calderas is Crater Lake, formed by an eruption of ____ ____ in Oregon thousands of years ago | Mount Mazama
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| an ____ volcano is one that has erupted recently or is considered likely to erupt in the near future | active
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| 1 famous active volcano | 1. Stromboli (strom bo le)
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2. Etna in Italy, Kilauea(ke lou a u)in the Hawaii, and Pinatubo(pe naltoo bo) in the Philippines are some famous active vocanoes
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| Mount St. Helens in the state of Washington has been considered an active volcano since_ _ _ _ | 1980
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| a volcano which has erupted many years ago and is now inactive, but which may erupt again, is classed as a ____ ____ | dormant volcano
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| volcanoes that have not been erupted in recorded history are likely to never erupt again, is called _____ volcanoes | extinct volcanoes
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| three common types of eruptions are ___ ___, _____ _____, and ______ ________ | Hawaiian eruptions,
Strombolian(strom bo le an)eruptions, and
Plinian(plin e an)eruptions
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| in a ___ ___ the volcano produces a large amount of fluid lava that surges from the volcano's vent like water from a fountain | Hawaiian eruption
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| If the lava gushes from a narrow conduit it may shoot dozens of yards into the air, forming a vertical geyser of lava called a ___ ___ | lava fountain
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| if the lava erupts from a long crack or fissure instead, it may produce a sheetlike fountain of glowing lava called a ___ ___ | fire curtain
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| a Strombolian eruption is are a very active volcano in Italy called ______ ________ | Mount Stromboli
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| Mount Stromboli is often called ___ ___ __ ___ | "Lighthouse of the Mediterranean"
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| Mount Stromboli erupt an average of once every ____ _________ | 20 minutes
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| Mount Stromboli has really ____ eruptions but usually quite mild | noisy
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| as gas bubbles up from the magma in the volcano's crater,globs of lava are flung into the air and harden into volcanic bombs;Occasionally produce flows of liquid lava and a more intense eruption causes lava to ooze down the sides of the_this is called _ _ | cone and Strombolian eruption
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| most ___ ___ come from volcanoes that have lain dormant for a long period of time | Plinian eruptions
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| in a ____ ____, the volcano expels hot clouds of gas and dust high into the atmosphere, forming ash clouds that may travel completely around the world and ; volcano has usually lain dormant for a long period of time | Plinian eruption
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| Plinian eruptions are usually quite _____ | violent
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| Mount St. Helens in 1980 was _____ times more powerful that atomic bombs; trees as far as 15 miles from the volcano were ripped from the earth, stripped of bark and branches, and tosses burning on the ash- covered ground | 500
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| the _ _ _ _ explosion of the Krakatoa(kra ku tou), was 20 more times powerful than Mount St. Helens | 1883
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| the explosion of Krakatoa(kra ku tou) was so loud that people could hear it from ______ miles away, and houses 80 miles away from the volcano had their windows shattered | 2,900
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| the explosion of Krakatoa(kra ku tou) had _______ produced by this eruption killed 36,000 people in the surrounding island | tsunamis
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| tsunamis mean | gaint waves
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| Relatively small, cone-shaped volcanoes formed mostly of tephra and quickly eroded | cinder cone volcanoes
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| frequent eruptions that are noisy but mild; | Strombolian eruption
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| the kind of volcano that is formed by alternating layers of fluid lava and tephra | composite volcanoes
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| holes or cracks that seve as escape vents for underground gasses | fumaroles
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| melted rock is what ____ | magma
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| molten rock that has reached the earth's surface is called _____ | lava
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