Detailed images provided by ________ suggest that the mantle is heterogeneous, probably due to variations in temperature, composition, and density.
A. shadow zone
B. deep drill holes
C. P-waves
D. seismic tomography
E. seismic reflection
Answer: E
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Most metals, such as iron and copper, do not occur in a pure state in Earth's crust, but occur within ________
A) ores B) sediments C) igneous rocks D) the O horizon of the soil E) organic materials
Food safety issues of transgenic crops include
A) a decreased production of allergens in crops. B) the promotion of antibiotic resistance in pathogens and new allergenic properties in crops. C) interference with the effectiveness of immunizations. D) the development of herbicide resistance in humans.
The Archean atmosphere can best be described as ____
A)oxygen-rich B)nitrogen-rich C)ozone-rich D)oxygen-deficient E)rich in carbon dioxide
Which of the following geologic resources was discussed for the area around St. George, Utah?
A. a large cement plant B. oil field C. floodplains with fertile soils D. All of these choices are correct. E. both oil field and floodplains with fertile soils only