Create an account
Lava flows are typically finer grained than intrusive igneous rocks. Why?
C. the extrusive magma cools quickly so the mineral grains do not have time to grow
The sizes, shapes, and arrangements of mineral grains in an igneous rock are known as ________.
A ________ is an open cavity in a volcanic rock that was filled by a gas bubble when the lava was still mainly liquid.
Which of the following igneous rocks exhibit aphanitic (fine-grained) texture?
B. andesite, rhyolite
The last minerals to crystallize on Bowen's Reaction Series are those found in igneous rocks with a ________ composition.
Change in the composition of magma caused by melting surrounding host rock is known as ________.
Plutonic rocks are intrusive and generally consist of mineral grains coarse enough to be readily visible in a hand sample.
Atoms of the same element, zinc for example, have the same number of ________.
A. protons in the nucleus
A cubic centimeter of quartz, olivine, and gold weigh 2.5, 3.0, and 19.8 grams respectively. This indicates that ________.
A. gold has a higher density and specific gravity than quartz and olivine
The strong tendency of certain minerals to break along smooth, parallel planes is known as ________.
Which of the following describes the light reflecting and transmission characteristics of a mineral?
Graphite and diamond have the same chemical compositions, but different crystalline structures.
The majority of the Earth's subduction zones are found in and around the ________ Ocean basin.
Which of the following volcanoes are associated with hot spots?
D. the volcanoes of Hawaii and geysers in Yellowstone National Park
Which of the following best describes seamounts and islands of the deep ocean basins?
D. piles of basaltic lava flows built up from the ocean floor by multiple, summit and flank eruptions
Which set of magma conditions produces the most explosive eruptions?
B. High viscosity and dissolved gas
Which kind of eruptive activity is most likely to be highly explosive?
A. eruptions of large composite cones (stratovolcanoes)
The average composition of rocks comprising a large composite cone or stratovolcano is similar to a (an) ________ magma.
A ________ volcano is a very large, gently sloping mound composed mainly of basaltic lava flows.
Why do magmas rise toward Earth's surface?
B. magmas are mainly liquid and contain dissolved fluids such as water; most are less dense than the adjacent solid rock
A ________ is an intrusive, igneous rock body that is tabular and concordant (parallel to adjacent sedimentary rocks).
Magma generation at depth almost always involves partial melting, not complete melting of the source rock.
Most basaltic magmas are believed to form by partial melting of granite in the lower crust and upper mantle.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together