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Geology for engineers || Spring25
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Which one of the following shows the correct order (left to right) of decreasing magma viscosity?
Obsidian has generally a ______ composition.
The coarse grained equivalent of a basalt is a
Which of the following processes create an igneous rock with porphyritic texture?
Which texture describes large phenocrysts embedded in a fine‐grained groundmass?
Which of the following rocks have the highest content of quartz
Which factor decreases crystal size in an igneous rock?
Felsic igneous rocks are rich in:
Three rocks A, B and C crystallized at 1200, 900 and 750 degrees Celsius, respectively. The correct order of their silica content from low (left) to high (right) is
Mafic igneous rocks are generally: