science key terms chapter:7
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What is a volcano? | A weak spot in the crust where magma reaches the surface.
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| What is magma? | The mixture of rock forming substances, gases, and water from the mantle.
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| What is lava? | Liquid magma that reaches the surface.
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| What is the Ring of Fire? | Major belt of volcanoes that rim the pacific ocean.
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| What is an island arc? | A string formed by the volcanoes along a deep ocean trench.
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| What is a hotspot? | An area where magma deep with in the mantle melts throught the crust above it.
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| What is an element? | A substance in which all the atoms are the same that can't be broken down into other substances.
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| What is a compound? | Substance in whichtwo or more elements are chemically joined.
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| What is a physical property? | Characteristics of a subsances that can be observed or measured without changing the composition.
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| What is a chemical property? | Substance that produces a change in the composition of matter.
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| What is viscosity? | Liquid's resistance to flowing
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| What is silica? | Material found in magma that is formed from the elements oxygen and silicon.
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| What is Pahoehoe? | A hot, fast moving type of lava that hardens to form smooth, ropelike coils.
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| What is Aa? | A slow moving type of lava that hardens to form a rough chunks.
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| What is a magma chamber? | The pocket where magma collects.
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| What is a pipe? | The long tube that magmas goes up through to reach the surface.
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| What is a vent? | The opening where magma leaves.
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| What is lava flow? | The area covered by lava as it is pours out of a volcanoe's vent.
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| What is a crater? | A bowl shaped srea that forms around a volcanoe's central opening.
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| What is a pyroclastic flow? | The expulsion of ash, cinders, and gases during an explosive eruption.
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| What is dormant? | A volcano that is not currently active but, that may be active in the future.
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| What is extinct? | A volcano that is no longer active and is unlikely to erupt again.
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| What is a sheild volcano? | A wide, gentle, sloping mountain made of layers of lavs and formed by quiet eruptions.
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| What is a cinder cone? | A steep cone shape hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano's opening.
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| What is a composite volcano? | A tall, cone shaped mountain in which layers of lavs alternate with layers of ash and other volcanic materials.
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| What is a caldera? | The large hole at the top of a volcano formed when the roof of a volcano's magma chamber collappses.
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| What is a volcanic neck? | A deposit of hardend magma in a volcano's pipe
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| What is a dike? | A slab of volcanic rock formed when magma forces itself across rock layers.
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| What is a sill? | A slab of volcanic rock formed when magma sqeezes between layers of rock.
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| What is a batholith? | A mass of rock formed when a large body of magma cools inside the crust.
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| What is geothermal activity? | The heating of underground water by magma.
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| What is geyser? | A fountain of water and steam that builds up pressure underground and erupts at regular intervals
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