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Vocabulary

Vocabulary. Magma Chamber: The pocket beneath a volcano where magma collects. Pipe: A long tube through which magma moves from the magma chamber to Earth’s surface. Vent: The opening through which molten rock and gas leave a volcano. Vocabulary. Lava Flow:

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Vocabulary

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  1. Vocabulary • Magma Chamber: • The pocket beneath a volcano where magma collects. • Pipe: • A long tube through which magma moves from the magma chamber to Earth’s surface. • Vent: • The opening through which molten rock and gas leave a volcano.

  2. Vocabulary • Lava Flow: • The area covered by lava as it pours out of a volcano’s vent. • Crater: • A bowl-shaped area that forms around a volcano’s central opening. • Silica: • A material that is formed from the elements oxygen and silicon; silica is found in magma.

  3. How Magma Reaches Earth’s Surface • True or False: Magma forms in the lithosphere. • What happens during a volcanic eruption? • During a volcanic eruption gasses that have been dissolved in the magma rush out, carrying the magma with them.

  4. Inside a Volcano • Circle the letter of each feature that all volcanoes share. • A. pocket of magma beneath the surface. • B. crack to the surface. • C. side vents. • D. crater.

  5. Inside a Volcano • What is a lava flow? • A lava flow is the area covered by lava as it pours out of a vent. • Where does a crater form? • A crater forms at the top of a volcano around the central vent. • True or False: The pipe of a volcano is a horizontal crack in the crust.

  6. Characteristics of Magma • What factors determine the force of a volcanic eruption. • Factors that determine the force of a volcanic eruption include the amount of gas dissolved in the magma, how thick or thin the magma is, its temperature, and its silica content.

  7. Types of Volcanic Eruptions • Hot, fast-moving lava is called ________. • Cool, slow-moving lava is called _____. • What is a pyroclastic flow? • A pyroclastic flow is an explosive eruption of ash, cinders, bombs, and gases. pahoehoe aa

  8. Vocabulary • Shield Volcano: • A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions. • Cinder Cone Volcanoes: • A steep, cone-shaped hill or mountain made of volcanic ash, cinders, and bombs piled up around a volcano’s opening.

  9. Vocabulary • Composite Volcano: • A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic material. • Caldera: • The large hole at the top of a volcano formed when the roof of a volcano’s magma chamber collapses.

  10. Shield VolcanoBelknap-Oregon

  11. Cinder Cone Volcano

  12. Composite VolcanoSt. Augustine, Alaska

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