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key terms ch:7
science key terms chapter:7
| Question | Answer |
|---|---|
| What is a volcano? | A weak spot in the crust where magma reaches the surface. |
| What is magma? | The mixture of rock forming substances, gases, and water from the mantle. |
| What is lava? | Liquid magma that reaches the surface. |
| What is the Ring of Fire? | Major belt of volcanoes that rim the pacific ocean. |
| What is an island arc? | A string formed by the volcanoes along a deep ocean trench. |
| What is a hotspot? | An area where magma deep with in the mantle melts throught the crust above it. |
| What is an element? | A substance in which all the atoms are the same that can't be broken down into other substances. |
| What is a compound? | Substance in whichtwo or more elements are chemically joined. |
| What is a physical property? | Characteristics of a subsances that can be observed or measured without changing the composition. |
| What is a chemical property? | Substance that produces a change in the composition of matter. |
| What is viscosity? | Liquid's resistance to flowing |
| What is silica? | Material found in magma that is formed from the elements oxygen and silicon. |
| What is Pahoehoe? | A hot, fast moving type of lava that hardens to form smooth, ropelike coils. |
| What is Aa? | A slow moving type of lava that hardens to form a rough chunks. |
| What is a magma chamber? | The pocket where magma collects. |
| What is a pipe? | The long tube that magmas goes up through to reach the surface. |
| What is a vent? | The opening where magma leaves. |
| What is lava flow? | The area covered by lava as it is pours out of a volcanoe's vent. |
| What is a crater? | A bowl shaped srea that forms around a volcanoe's central opening. |
| What is a pyroclastic flow? | The expulsion of ash, cinders, and gases during an explosive eruption. |
| What is dormant? | A volcano that is not currently active but, that may be active in the future. |
| What is extinct? | A volcano that is no longer active and is unlikely to erupt again. |
| What is a sheild volcano? | A wide, gentle, sloping mountain made of layers of lavs and formed by quiet eruptions. |
| 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. |
| What is a composite volcano? | A tall, cone shaped mountain in which layers of lavs alternate with layers of ash and other volcanic materials. |
| What is a caldera? | The large hole at the top of a volcano formed when the roof of a volcano's magma chamber collappses. |
| What is a volcanic neck? | A deposit of hardend magma in a volcano's pipe |
| What is a dike? | A slab of volcanic rock formed when magma forces itself across rock layers. |
| What is a sill? | A slab of volcanic rock formed when magma sqeezes between layers of rock. |
| What is a batholith? | A mass of rock formed when a large body of magma cools inside the crust. |
| What is geothermal activity? | The heating of underground water by magma. |
| What is geyser? | A fountain of water and steam that builds up pressure underground and erupts at regular intervals |
Created by:
LilKae101
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