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Volumetrically, most lava is of basaltic composition. Basaltic melts have overall lower gas contents and are more fluid than their andesitic-to-rhyolitic counterparts. Their higher fluidity (lower viscosity) is a product of their lower SiO2 (silica) contents. When gases exsolve from basaltic melts they are allowed to rise unimpeded through the fluid magma without a significant build up of gas pressure. This results in relatively calm, nonexplosive eruptions, and a preponderance of lava. In contrast, when gases exsolve from felsic magmas, their upward mobility is impeded by the high viscosity of the melt. This results in the buildup of gas pressure, which generates explosive eruptions associated with a preponderance of pyroclastic ejecta. The low viscosity of basaltic lavas allows them to be extruded over great distances, often producing high-volume lava flows with low aspect ratios (ratio of thickness to area). Under the right conditions, de-gassed felsic magmas can also erupt lava in a nonviolent manner. However, felsic lavas tend to be much thicker than basaltic lavas and have much higher aspect ratios.
source:www.geology.sdsu.edu
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Are basaltic lavas a pahoehoe lava?
Not necessarily. All pahoehoe is basaltic, but not all basaltic lava is pahoehoe. A'a and scoria are also basaltic.
Which lava is less viscous rhyolitic or basaltic?
Basaltic lava is less viscous.
What are the three types of lava flows associated with basaltic lava?
basaltic lava can form a'a, pahoehoe, or pillow lava.
What type of lava comes from what volcano?
Shield volcanoes will erupt basaltic lava. Cinder cones erupt basaltic lava or basaltic andesite lava. Stratovolcanoes often erupt andesite lava, but may erupt basaltic or rhyolitic lava and all intermediate types as well.
Is basaltic lava less fluid than andesitic lava?
No. Basaltic lava has less silica than andesitic lava which makes it less viscous and so basaltic lava flows more easily than andesitic lava.
Is it basic lava or basaltic lava?
It's basaltic lava, not basic.
What is the hottest lava in a volcano?
The hottest lava on Earth today is basaltic lava. This lava erupts at temperatures of 1,800 to 2,200 degrees Fahrenheit.
Are basaltic lavas a pahoehoe lava?
Not necessarily. All pahoehoe is basaltic, but not all basaltic lava is pahoehoe. A'a and scoria are also basaltic.
Which lava is less viscous rhyolitic or basaltic?
Basaltic lava is less viscous.
What are the three types of lava flows associated with basaltic lava?
basaltic lava can form a'a, pahoehoe, or pillow lava.
What type of lava comes from what volcano?
Shield volcanoes will erupt basaltic lava. Cinder cones erupt basaltic lava or basaltic andesite lava. Stratovolcanoes often erupt andesite lava, but may erupt basaltic or rhyolitic lava and all intermediate types as well.
Is basaltic lava less fluid than andesitic lava?
No. Basaltic lava has less silica than andesitic lava which makes it less viscous and so basaltic lava flows more easily than andesitic lava.
Does basaltic or rhyolitic lava flow faster?
Basaltic lava flows much faster than ryholitic lava.
What type of volcano has basaltic lava?
A volcano has magma,the molten rock that comes from the core of the earth.
What type of lava does Mt Etna have?
Granitic with a high water content, resulting in powerful steam explosions during eruptions.
Is lava butte basaltic or granitic lava flow?
A lava butte is generally basaltic lava. Granitic lava flows (called rhyolitic when they form at the surface) are rare and do not cover much ground.
What type of lava does shield a shield volcano have?
Mafic, more commonly called Basaltic.
