eq: what differences exist between types of lava flow?
TRANSCRIPT
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VOLCANOES: LAVA FLOW
EQ: What differences exist between types of lava flow?
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LAVA FLOW Depends on:
TemperatureSilica content/Chemical compositionSlope of the landViscosity (the state of being thick, sticky,
and semifluid consistency)
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TYPES OF LAVA Pillow Lava Pahoehoe (paw-hoey-hoey) A’a (ah-ah) Block Lava Rhyolite Lava (Rie-o-lite)
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PILLOW LAVA Most abundant type of lava Large, elongated, interconnected lobes
that are elliptical or circular in cross-section
Important when looking at old rock sequences Indicates the presence of water
The underwater equivalent to pahoehoe Made mostly of basalt
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PILLOW LAVA
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PILLOW LAVA
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PILLOW LAVA
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PAHOEHOE 2nd most abundant type of lava flow. Smooth, billowy, ropy surface Relatively thin flow (few inches to a few
feet thick) Lava cools slowly, moves slowly Made mostly of basalt
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PAHOEHOE
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PAHOEHOE
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PAHOEHOE
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A’A Rough, jagged surface Aa lava flows tend to be thicker
compared to pahoehoe Cools quickly and moves fast Made mostly of basalt
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A’A
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A’A
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A’A
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BLOCK Block lava has a surface comprised of
large angular blocks. Block lava also refers to solid rock that
is ejected during an eruption.
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BLOCK
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BLOCK
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BLOCK
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RHYOLITE Rhyolite Lava is light in color, contains
69% silica or more. Rich in potassium or sodium.
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RHYOLITE
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RHYOLITE
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RHYOLITE