volcanoes
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20 terms
Terms | Definitions |
|---|---|
 volcano | weak spot in the crust where molten material, comes to the surface. |
| magma | molten mixture of rock-forming substances, gases, and water from the mantle. |
| lava | when magma reaches the surface. |
| hot spots | occur where ever there are plate boundaries. |
| dike | forms when magma forces itself across rock layers and hardens. |
| sill | forms when magma squeezes between layers of rock and hardens. |
| vent | opening were the magma leaves the volcano towards the surface. |
| silica | material found in magma that is made of oxygen and silicon. |
| dormant volcano | volcano is not active, but may become active in the future. |
| active volcano | that is erupting or shows signs of erupting in the future. |
| extinct volcano | unlikely erupt ever again. |
| geyser | is a fountain of water and steam that erupts from the ground. |
| basin | is formed when plate movements cause the crust to warp downward, forming a large bowl-shaped valley. |
| caldera | huge hole left by collapse of a volcanic mountain. |
| pipe | long tube that connects the magma chamber to Earth's surface. |
| shield volcano | layers of harden lava that gradually build a wide, gently sloping mountain. |
| cinder cone | materials that have exploded from the volcano began to pile up around the vent, forming a steep, cone-shaped hill or mountain. |
| composite volcano | materials that have exploded from the volcano start alternating to form tall, cone-shaped mountain. |
| Volcano neck | forms when magma hardens in a volcano's pipe |
| batholith | large body of cooling magma found inside the crust, that becomes into a massive rock. |
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