Igneous Rocks

Question 4 1.5 / 1.5 points If a body of magma becomes more felsic, its viscosity will ____________. Question options: increase decrease stay the same

increase

Question 2 1.5 / 1.5 points Igneous rocks ____________. Question options: are formed through the freezing of melt can be produced at the surface of the Earth as well as deep below the surface are the most common type of rocks within Earth all of the above

all of the above

Question 6 1.5 / 1.5 points As compared to coarse-grained igneous rocks, all fine-grained igneous rocks ____________. Question options: cool and solidify more quickly cool and solidify more slowly solidify at higher temperatures solidify at lower temperatures

cool and solidify more quickly

Question 7 1.5 / 1.5 points All other factors being equal, intrusive rocks that form deep within Earth ____________ than intrusive rocks that cool near the surface. are more felsic contain a smaller proportion of volatiles cool more slowly cool more rapidly

cool more slowly

Question 3 1.5 / 1.5 points When magma crystallizes, ____________ are formed. Question options: intrusive igneous rocks extrusive igneous rocks volatiles pyroclastic debris

intrusive igneous rocks

Question 1 1.5 / 1.5 points The difference between lava and magma is that ____________. Question options: magma is light in color and lava is dark magma usually has mafic composition and lava usually has felsic composition magma is found beneath the Earth's surface, whereas lava has reached the surface magma flows more quickly than lava

magma is found beneath the Earth's surface, whereas lava has reached the surface

Question 5 1.5 / 1.5 points When rock is partially melted, the chemistry of the melt is ____________. Question options: more mafic than the original chemistry of the rock that was partially melted more felsic than the original chemistry of the rock that was partially melted identical to the original chemistry of the rock that was partially melted completely unpredictable (it could be more mafic or more felsic

more felsic than the original chemistry of the rock that was partially melted

Question 9 1.5 / 1.5 points In Bowen's discontinuous reaction series, the first mineral to crystallize from a mafic melt is ____________. Question options: olivine plagioclase pyroxene quartz

olivine

Question 10 1.5 / 1.5 points An igneous rock with a mixed texture of coarse grains (phenocrysts) surrounded by fine crystals (groundmass) is termed ____________. Question options: porphyritic phaneritic aphanitic necrotic

porphyritic

Question 8 1.5 / 1.5 points Coarse-grained granite is most similar in mineral composition to fine-grained ____________. Question options: andesite basalt komatiite rhyolite

rhyolite