EQ: What differences exist between types of lava flow?

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Presentation transcript:

EQ: What differences exist between types of lava flow?

 Depends on:  Temperature  Silica content/Chemical composition  Slope of the land  Viscosity (the state of being thick, sticky, and semifluid consistency)

 Pillow Lava  Pahoehoe (paw-hoey-hoey)  A’a (ah-ah)  Block Lava  Rhyolite Lava (Rie-o-lite)

 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

 2 nd 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

 Rough, jagged surface  Aa lava flows tend to be thicker compared to pahoehoe  Cools quickly and moves fast  Made mostly of basalt

 Block lava has a surface comprised of large angular blocks.  Block lava also refers to solid rock that is ejected during an eruption.

 Rhyolite Lava is light in color, contains 69% silica or more.  Rich in potassium or sodium.