What is the source of high carbon dioxide levels at middle depths in the ocean?
A) The decay of the remains of organisms
B) It diffuses from the atmosphere
C) Chemical reactions
D) Plant respiration
A
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For most streams, bank full discharge occurs
A) daily. B) about once per month. C) about once every 2 years. D) about once every 75 years.
If your ancestors migrated to the United States during the 1840s and 1850s, barring any other evidence, you might strongly suspect that they originated in
A) Norway or England. B) Ireland or Germany. C) Italy or Poland. D) Spain or Portugal. E) Russia or Bulgaria.
The world's largest state is
A) China. B) Canada. C) Russia. D) Alaska. E) India.
Which of the following best describes how metamorphic rocks form?
A. Crystallization of magma B. Increased pressure and temperature C. Precipitation of minerals D. Lithification of sediment E. Weathering and erosion