Science Volcanoes Test
Terms in this set (27)
Currently erupting volcano
Still alive, but not currently erupting
Will not erupt again
An opening in Earth that erupts gases, ash, and lava.
Areas between Earth's mantle and core that are unusually hot. They don't move.
Trapped Gases, Composition of Magma, Silica
Lava that runs down the side of a volcano. It is thin and smooth.
A stiff, slow moving lava.
Quiet eruptions of basaltic lava spread out in flat layers. Layers build up and form a broad volcano with gently sloping sides. Hawaiian Islands. Pahoehoe lava
Cinder Cone Volcanoes
Explosive eruptions throw lava and rock high into the air. When rock and ash land, it forms a steep-sided, loosely packed volcano. Paricutín, Mexico
Varying explosions depend an amount of silica and trapped gases. Alternating layers of lava and ash form a volcano.
Mount Rainier, WA
The measure of a material's resistance to flow.
What effects viscosity
Temperature and Silica Content.
Particles produced in volcanic eruptions
Fragments less than 2 millimeters in diameter of lava or rock blasted into the air by volcanic explosions. The most dangerous eruptive material
Fragments of fluid or partially fluid lava or rock larger than 64 millimeters in size that are blasted into the air by volcanic explosions.
A light-colored, frothy, vesicular volcanic rock, usually of intermediate and felsic composition, formed by the expansion of gas in erupting lava.
Large depressions in volcanoes. Nearly circular. Formed by collapse. Size exceeds one kilometer in diameter.
Fluid basaltic lava extruded from crustal fractures called fissures.
Hydrogen Chloride (HCI), Hydrogen Sulphide (H2S), Hydrogen Fluoride (HF), Carbon Dioxide (CO2).
Debris avalanche events, landslides, caldera collapse events, and pyroclastic flows entering a body of water may generate this.
High in silica. Forms composite or Strata-volcanoes. Eruptions are very violent.
Flows more, high in basalt. Usually forms shields and domes. Can form other things.
Predicting volcanic hazards
Tilting and swelling of the volcano's sides. Increased seismic activity. Seismic Exploration.