| A | B |
|---|
| volcano | opening in the earth's surface where magma reaches Earth's surface |
| magma | molten rock beneath the Earth's surface |
| lava | molten rock on the Earth's surface |
| Ring of Fire | Volcano belt that rims the Pacific Ocean |
| island arc | a string of island formd by the volcanoes along a deep ocean trench |
| hot spot | magma formed deep within the mantle rises and melts through the crust above it |
| geothermal energy | type of energy used to heat homes and produce electricity |
| pyroclastic flow | an eruption flow that includes ashes, cinders, and bombs |
| geyser | a fountain of water and steam that builds up pressure underground and erupts at regular intervals |
| dormant | a sleeping volcano that could erupt in the future |
| extinct | a dead volcano or a vvolcano that can not longer erupt |
| pipe | a long tube through which magma moves from the magma chamber to the earth's surface |
| vent | opening through which molten rock and gas leave a volcano |
| pahoehoe | fast-moving, hot lava |
| shield volcano | wide, gently sloping volcano |
| composite volcano | alternating eruptions of ash, cinder, and bombs alternating with lava |
| cinder cone | a steep, cone-shaped volcano |
| dike | magma that forces itself into a vertical crack |
| sill | magma that forces itself between horizontal layers of rock |
| batholith | a mass of formed when a large body of magma cools inside the crust |
