Use Figure 8.20 to compare the P-wave velocities of oceanic and continental crust at a depth of 10 km. Why are these velocities different?
What will be an ideal response?
The P-wave velocity of oceanic crust at a depth of 10 km is 7 km/s. The P-wave velocity of continental crust at a depth of 10 km is 6 km/s. The difference is due to composition (rock-type). The oceanic crust is made up of mafic rocks and the continental crust at 10 km is made up of felsic rocks.
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If you observe some natural phenomena occurring and want to understand what is going on, what is the basic scientific method?
What will be an ideal response?
A ____________________ rock forms when a pre-existing rock is subjected to high temperatures, high pressures, chemically active fluids, or a combination of these agents.
Fill in the blank(s) with the appropriate word(s).
How did the sedimentary environments of the Kaskaskia sequence differ from those of the Absaroka sequence in
North America? What will be an ideal response?
Cattle production in the United States and other developed nations involves CAFOs that
A) produce large amounts of manure, all of which is diverted into soil restoration. B) produce 14% of the greenhouse gas methane, which causes global warming. C) generate income used to support the large population of native people. D) produce leather, which sustains millions of workers in the Brazilian leather industry.