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Basalt is also an important rock type on other planetary bodies in the Solar System. For example, the bulk of the plains of Venus, which cover ~80% of the surface, are basaltic; the lunar maria are plains of flood-basaltic lava flows; and basalt is a common rock on the surface of Mars.
Rhyolite (/ ˈ r aɪ. ə l aɪ t / RY-ə-lyte) [1] [2] [3] [4] is the most silica-rich of volcanic rocks.It is generally glassy or fine-grained in texture, but may be ...
The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...
Rivers of lava spewed from a fissure in the mountainside, snaking downwards and erupting in fountains of red and gold molten rock when the Fagradalsfjall volcano erupted this week in a fishing ...
Like other silica-rich compositions, rhyodacites are more abundant as pyroclastic rock than as lava flows. [6] These include extensive ash flows and fallout sheets that are important stratigraphic markers. [5] Rhyodacite lava flows occur in northwestern Ferry County (Washington), [4] and at An Sgùrr on the island of Eigg in Scotland. [7]
Komatiitic lava was extremely fluid when it erupted (possessing the viscosity close to that of water but with the density of rock). Compared to the basaltic lava of the Hawaiian plume basalts at ~1200 °C, which flows the way treacle or honey does, the komatiitic lava would have flowed swiftly across the surface, leaving extremely thin lava ...
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