Mrs. Wilson's chapter 8 vocab words
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25 terms
Terms | Definitions |
|---|---|
 earthquake | a trembling or shaking of the earths crust |
| focus | the point in which a earthquake begins |
| epicenter | the piont directly above the focus on the surface of the earth |
| seismograph | an instrument used to study the vibrations of the earth |
| the mericalli scale | a scale based on observations and mans opinion |
| the richtor scale | a scale based on the patterns of the seismograph |
| primary wave | a rythmic push pull motion |
| secondary wave | a rythmic side to side motion |
| tremor | weak earthquakes |
| aftershock | smaller earthquakes the follow an earthquake |
| volcano | an opening in the earths surface through which hot gasses, ashes, and molten rock are ejected from the earths interior |
| volcanology | the study of volcanoes and volcano-related phenomena |
| cinder-cone volcano | volcanoes that consist primarily of rock fragments and volcanic ash |
| sheild volcano | a volcano with broad, gently sloping sides |
| composite volcano | a volcano that has both characteristics of a sheild and cinder-cone volcano |
| active volcano | a volcano that has erupted in the last 50 years or less |
| dormant volcano | a volcano that hasnt erupted in a while |
| extinct volcano | a volcano thatwill probally never erupt again |
| ejecta | anything ejected from a volcano |
| aa lava | lava that hardens into a rough jagged texture |
| pahoehoe | lava that hardens into a smooth or ropy texture |
| pyroclast | particals or blocks of solid ejecta |
| volcanic ash | pyroclasts with a 4mm diameter |
| caldera | a collapsed lava chamber |
| nuee ardente | a superheated incandescent cloud, which consists of gas and volcanic ash, that travels swiftly down the volcano |
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