SCI

• VOLCANOES

  opening in Earth's crust
• Volcano form when magma rises to the surface
• MAGMA CHAMBER

  reservoir when magma is stored beneath in volcano
• ASH CLOUD

  mass of tiny volcanic rock fragments dust gases; release in the air
• CONDUIT

  a pipe like structure that connects the magma chamber to surface
• SILL

  flat rock formation that forms when molten magma cools and solidifies in crack
• CRATER

  bowl shape at the top of volcano
• CONE

  steep, conical shape hill or mountain form by layer of volcanic material
• LAVA

  molten rock that flows from volcano during eruption
• SHIELD VOLCANO

  form from layer of cooled lava
• CINDER CONE

  form by explosive eruption of ash and dust
• COMPOSITE VOLCANO

  tall symmetrical and compose of layers of ash and lava flows
• ICELANDIC ERUPTION

  runny lava that floods the Earth's surface
• HAWAIIAN ERUPTION

  numerous fissures result in large quantities of runny lava
• STROMBOLIAN ERUPTION

  short explosive; shoot thick lava and gas in air
• VULCANIAN ERUPTION

  high dark clouds; builds cauliflower shape head
• STRATOVOLACANOES ERUPTION

  most common; explosive
• PELEAN ERUPTION

  violent explosion causing the volcano summit to collapse
• PLINIAN ERUPTION

  most powerful; high towering ash cloud
• PYROCLASTIC MATERIAL

  fragments of lava rock ash eject in air
• VOLCANIC ASH

  fine particles of volcanic rock that carried by wind
• VOLCANIC GASES

  water vapor carbon dioxide sulfur dioxide