click below
click below
Normal Size Small Size show me how
ES EMAP Chapter 6
Volcanoes
| Term | Definition |
|---|---|
| Volcano | An opening in the earth that erupts gases, ash, and lava |
| Crater | Steep-walled depression around a volcano's vent |
| Vent | An opening in the earth through which gases, ash, and lava erupt |
| Hot Spot | Areas between the earth's mantle and core that are unusually hot |
| Basaltic | Refers to magma low in silicate materials. It is usually thin and flows easily |
| Granitic | Refers to magma high in silicate materials. It is usually thick and flows only with difficulty |
| Shield Volcano | A broad volcano with gently sloping sides |
| Tephra | Bits of rock solidified from lava ejected into the air |
| Cinder Cone Volcano | A steep-sided, loosely packed volcano |
| Composite Volcano | A volcano with alternating layers of tephra and lava flows |
| Krakatau | Island cinder cone in Indonesia. Violent eruption in 1883 caused global temperature to drop by 1.5 degrees. |
| Paricutin | Cinder cone in Mexico. Cinder cone grew in farmers field and eventually covered neighboring towns and villages |
| Vesuvius | Composite cone in Italy. Eruption in 79 A.D. buried the city of Pompeii. |
| Tambora | Island composite cone in Indonesia. Most violent eruption in recorded history. Violent eruption in 1815 caused "volcanic winter", resulting in the worst famine of the 1800's. |
| Kilauea | Shield cone of Hawaii |
| Laccolith | A dome-shaped pluton, made from viscous magma injected between strata of rock near the surface |
| Pluton | A body of intrusive igneous rock |
| Batholith | Extremely large pluton formed deep within the earth when large volumes of magma cool |
| Dike | Pluton formed from magma cross-cut through existing rock layers |
| Sill | Flat pluton formed when magma is injected between existing rock strata |
| Strata | Rock layers |
| Neck | Pluton formed from magma in a vent cooling |
| Caldera | A large depression caused by the collapse of the top of a volcano |