6th Grade Ch. 3 Sec. 3 Volcanic Eruptions
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Transcript of 6th Grade Ch. 3 Sec. 3 Volcanic Eruptions
Ch. 3Ch. 3Sec. 3 Sec. 3
Volcanic Volcanic eruptionseruptions
Pele's hairPele's hair• Thin strands of volcanic glass drawn out from molten
lava have long been called Pele's hair, named for Pele, the Hawaiian goddess of volcanoes.
• A single strand, with a diameter of less than 0.5 mm, may be as long as 2 m.
• The strands are formed by the stretching or blowing-out of molten basaltic glass from lava, usually from lava fountains, lava cascades, and vigorous lava flows (for example, as pahoehoe lava plunges over a small cliff and at the front of an aa flow).
magma chambermagma chamber
ventvent
pipepipe
Erupting volcano labeling activity
Side vent
side vent
1.As magma rises to surface pressure of surrounding rock on magma decreases
2.Dissolved gases expand forming bubbles
3.Cause enormous force causing eruption
pyroclastic flow•explosive eruption
•hurls out ash, gases, cinders, & bombs
http://www.youtube.com/watch?v=WxlRpuTed6g
This car is covered with volcanic dust spewed from Mt. Pinatubo, in the Phillippines.
volcanic bomb
Volcano hazards1. jets crash
2. landslides & avalanches
3. hard to breathe
4. mudflows
obsidian• forms when lava cools very quickly
•smooth, glossy surface
• Definitions• crust - Earth's outermost, rocky layer. • lava - molten rock; it usually comes out of erupting volcanoes.• magma chamber - contains magma (molten rock) deep within the
Earth's crust. • side vent - vent in the side of a volcano. • vent - opening in the Earth's surface through which volcanic materials
erupt.
pipe
side vent
magma
chamber
magma chamber
pocket beneath the surface in which magma collects
pipe
long tube in ground that connects magma chamber to Earth’s surface
vent
opening thru. which gas & lava leave volcano
vent crater
crater
bowl-shaped area that forms at top of volcano around central vent