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Volcanoes
Term | Definition |
---|---|
Magma | molten material beneath or within the earth's crust, from which igneous rock is formed. |
Dormant | lying asleep or as if asleep; inactive, as in sleep; torpid: The lecturer's sudden shout woke the dormant audience. |
Volcano | a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals. |
Lava | the molten, fluid rock that issues from a volcano or volcanic vent. |
Vent | an opening, as in a wall, serving as an outlet for air, smoke, fumes, or the like. |
Conduit | a pipe, tube, or the like, for conveying water or other fluid. |
Ash | the powdery residue of matter that remains after burning. |
Volcanologist | the scientific study of volcanoes and volcanic phenomena. |
Geyser | a hot spring that intermittently sends up fountain like jets of water and steam into the air. |
Extinct | no longer in existence; that has ended or died out: an extinct species of fish. |
Active | being in a state of existence, progress, or motion: active hostilities. |
Crater | the cup-shaped depression or cavity on the surface of the earth or other heavenly body marking the orifice of a volcano. |
Igneous Rock | Rocks formed by the cooling and solidifying of molten materials. Igneous rocks can form beneath the Earth's surface, or at its surface, as lava. |