Igneous Rocks Question Preview (ID: 56780)
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Which rock most probably formed directly from lava cooling quickly at Earth’s surface?
a) A
b) B
c) C
d) D
Rhyolite is an example of a
a) monomineralic igneous rock
b) polymineralic igneous rock
c) monomineralic sedimentary rock
d) polymineralic sedimentary rock
Part of a gemstone’s value is based on the way the gemstone shines in reflected light. The way a mineral reflects light is described as the mineral’s
a) fracture
b) hardness
c) luster
d) streak
Sapphire is a gemstone variety of which mineral on Moh’s scale of hardness?
a) corundum
b) diamond
c) fluorite
d) topaz
Analysis of a granite pebble would probably show that the pebble consists mostly of the
a) minerals quartz and feldspar
b) minerals calcite and gypsum
c) elements iron and magnesium
d) elements carbon and hydrogen
Which relative concentrations of elements are found in a felsic rock?
a) a high concentration of aluminum and a low concentration of iron
b) a high concentration of iron and a low concentration of aluminum
c) a high concentration of magnesium and a low concentration of iron
d) a high concentration of magnesium and a low concentration of aluminum
Which property would be most useful for identifying igneous rocks?
a) kind of cement
b) mineral composition
c) number of minerals present
d) types of fossils present
Which rock took the longest time to solidify from magma deep within the Earth?
a) A
b) B
c) C
d) D
The fine-grained texture of most of the igneous rock formed on the surface of Iceland is due to
a) rapid cooling of the molten rock
b) high density of the molten rock
c) numerous faults in the island’s bedrock
d) high pressure under the island
Which statement best describes the igneous crustal bedrock below locations A, B, C, and D?
a) The bedrock below D is mostly basalt; below A, B, and C, the bedrock is mostly granite.
b) The bedrock below D is mostly granite; below A, B, and C, the bedrock is mostly basalt
c) The bedrock below A, B, C, and D is mostly basalt.
d) The bedrock below A, B, C, and D is mostly granite.
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