Volcanoes and Extrusive Rocks
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| The last volcano to erupt in the continental 48 states was __. | Mount St. Helens
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| The term ___ is used for molten rock on the Earth's surface. | lava
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| Condensation of the water vapor by degassing magma during the time following Earth's formation produced the ____. | hydrosphere
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| _____ are tunnel-like caves within a lava flow. | Lava tubes
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| Shield volcanoes have ___ bases and ___ inclined slopes. | broad; gently
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| Occasionally, a volcano will spew large amounts of fine volcanic dust into the high atmosphere. This dust can have the effect of __. | All of the answers are correct.
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| What are the three factors that influence viscosity of a lava? | silica content, temperature, dissolved gases
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| A _____ is a mixture of gas and pyroclastic debris that is so dense that it hugs the ground as it flows rapidly into low areas. | pyroclastic flow
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| The Roman city of _____ was destroyed by the eruption of Vesuvius in 79 AD | Pompeii
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| The more _____ the lava, and the greater the amount of gas trying to escape, the more violent the eruption. | viscous
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| Because _____ magmas are the most viscous they are associated with the most violent eruptions. | silica-rich
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| The most abundant silicic volcanic rock is __. | rhyolite
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| The most common mafic volcanic rock is __. | basalt
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| A _____ volcano is composed of alternating layers of pyroclastic fragments and solidified lava flows. | composite
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| _________ crystallizes from an intermediate composition lava. | Andesite
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| Eruptions of shield volcanoes fed by mafic magma tend __. | not to be explosive or particularly dangerous
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| A _________ is a volcanic depression much larger than the original crater, formed when the volcano collapses into a vacated magma chamber. | caldera
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| _____ describes the surface of a basalt flow with a smooth ropy surface. | Pahoehoe
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| _____ describes the surface of a basalt flow with a jagged, rubble surface. | Aa
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| A ______ is a volcano constructed of pyroclastic fragments ejected from a central vent. | cinder cone
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| A _________, a mixture of gas and volcanic debris, may blast out laterally under a viscous plug capping a volcano. | pyroclastic flow
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Created by:
Thomas.Siu
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