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Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment?
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
When granite melts and then solidifies, it becomes
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
Mineral crystals of quartz, biotite mica, and amphibole are produced primarily by the
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole?
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
Which characteristic provides the best evidence that this pegmatite solidified deep underground?
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
Which texture best describes an igneous rock that formed deep underground?
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
Which characteristic provides the best evidence that this pegmatite solidified deep underground?
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
Which process could lead directly to the formation of pumice rock?
cooling and solidification of magma
an igneous rock
coarse grained
very coarse texture
explosive eruption of lava from a volcano
gabbro
very coarse texture
noncrystalline glassy texture
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