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Volcanoes L1-3
Mi-STAR 7.6 vocabulary
| Question | Answer |
|---|---|
| eruption | the emission of volcanic products such as lava, ash, and gasses from a volcano; as a geologic process, usually occur as sudden events, can be explosive or nonexplosive |
| stratovolcano | a steep-sided, often cone-shaped volcanic peak, formed by layers of ash, relatively sticky lava and other eruption products. |
| shield volcano | a broad, dome-shaped volcano with gently sloping sides formed by layers of relatively fluid lava. |
| fissure vent | A linear crack, usually at the bottom of the ocean, through which lava erupts. |
| caldera | A very wide crater, formed by the collapse of the top of a volcano after a very big eruption. |
| asthenosphere | The upper layer of the Earth’s mantle, where convection currents occur |
| lithosphere | The rigid outer part of the Earth consisting of the crust and upper mantle |
| core | The very hot, very dense center of our planet; made up mainly of iron and nickel |
| Inner core | Makes up Earth’s magnetic field, spins very fast; is solid |
| Outer core | Is liquid |
| Convection currents | The motion of molten rock in the mantle as it is heated and cooled |
| crust | The solid surface of the Earth (including the seafloor beneath the oceans). |
| mantle | The semi-solid, thick, very hot layer beneath the crust. |
| crystal | A special kind of solid which has a regular shape, often with shiny surfaces. |
| crystalization | The formation of a crystal from a liquid, often during cooling. |
| lava | Molten liquid rock material that comes out of a volcano and forms rocks. |
| molten | A property of a substance meaning liquified by heat. |
| Tectonic plate | A large piece of Earth’s crust that is on top of the mantle. |
| Ocean plate | A tectonic plate at the bottom of the ocean made of dark rocks. |
| Continental plate | A tectonic plate made up of light rocks that forms the continents. |
| Spreading ridge | The location where tectonic plates separate and new rock is formed. |
| Subduction zone | The location where tectonic plates collide and one sinks under the other, destroying rock. |
| Divergent boundary | two plates are moving away from each other; new plate material is created |
| Convergent boundary | two plates are moving toward each other |
| Transform boundary | two plates are sliding past each other (earthquakes) |
| magma | molten rock material inside Earth |
| melting | the transition of solid rock to a liquid magma when heated; occurs at subduction zones |
Created by:
jordan529
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