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Types of Lava Flows

Andesitic Magma -- SiO2 55-65 wt%, Intermediate
Andesitic Magma -- SiO2 55-65 wt%, Intermediate

SiO2, 55-65% wt. Intermediate in Fe, Mg ... it returns to the surface and flows down slope as lava ... distinct blasts of basaltic to andesitic magma from the ...

source: quizlet.com
Basaltic Magma
Basaltic Magma

What Is Basaltic Lava? When you envision lava in your mind, you likely think about rivers of molten rock flowing over a landscape much like Hawaii. This idealized vision of lava is actually basaltic lava. Basaltic lava is the most abundant lava on earth and is the lava most commonly depicted in pictures and media.

source: study.com
Pahoehoe
Pahoehoe

Pahoehoe lava flows are characterized by smooth, gently undulating, or broadly hummocky surfaces. The liquid lava flowing beneath a thin, still-plastic crust drags and wrinkles it into tapestry-like folds and rolls resembling twisted rope.

Pillow Lava
Pillow Lava

Pillow flows are produced by the piling up of individual pillow lava lobes. As a pillow flow forms, the newest pillows are erupted from the top of the stack and flow outward a limited distance before freezing, a process which tends to produce steep-sided mounds or ridges which can grow to be 10's of meters thick.

source: pmel.noaa.gov
image: kscnet.ru
Rhyolitic Magma
Rhyolitic Magma

Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcrops of rhyolite may bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas.

image: nps.gov

Related Types