What generates the magma necessary for seafloor spreading?
A) Decompression melting
B) Partial melting
C) Mantle plumes
D) Subduction
Answer: A
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Bedrock, because of its strength and rapid transmittal of seismic waves, increases the amplitude of those waves
Indicate whether the statement is true or false
Soils with the greatest water-holding capacity tend to have
A) poor aeration and the lowest workability. B) poor nutrient-holding capacity and good workability. C) good water infiltration and workability. D) good aeration and poor workability.
Exposure to indoor formaldehyde pollution is least likely to cause ____.
A. ulcers B. headaches C. chronic breathing problems D. dizziness E. sinus and eye irritation
Why was corn an important crop in the Inland South during the 19th and early 20th century?
A) It was sold for export to countries with food shortages B) It was used as feed for draft animals that plowed the fields C) It was used to make distilled alcohol sold all over the United States D) It was used to make grits, a staple food.