What was the reason for installing a worldwide network of seismometers in the 1950s and 1960s?
A) to save human lives by predicting volcanic eruptions and earthquakes
B) to study plate tectonic theory
C) to monitor underground nuclear bomb testing
D) to study mine blasts
Answer: C
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Why is methane gas the least abundant gas in magmas?
A) Methane is only found deep within the earth. B) Methane is repelled by heat. C) Water vapor, carbon dioxide, and odorous sulfur compounds are the primary gases. D) Methane turns to liquid in the presence of magma.
Pollution concentration is
A) determined solely by the quantity of emissions. B) determined solely by the wind speed. C) the quantity of a pollutant found within a specific volume of air. D) always higher during the day than at night.
Why does soil erosion occur?
A. poor farming practices B. deforestation C. construction D. All of these choices are correct.
Which of the following statements about increasing ocean temperatures as a result of global warming is correct?
A) Deep ocean waters are not yet showing signs of increased temperature. B) Deeper ocean waters are warming faster than expected. C) Ocean warming has not been documented below a depth of 0.5 kilometers. D) The warming of surface waters is uniform throughout the ocean. E) There has been an overall decrease in ocean surface temperature.