The sharp decrease in atmospheric 14C in the past decade is directly related to
A) a drop in global photosynthesis.
B) increasing methane levels.
C) decreasing temperatures in the troposphere.
D) increased use of in fossil fuels.
D
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Dry deposition occurs when ____.
A. pollution levels are low B. acidic particulates fall to the ground C. pollutants are released in cold air D. pollution travels a large distance from its source E. acidic snow, rain, or fog reaches the ground
Tidal range is smallest during spring tides
Indicate whether the statement is true or false
Frederick Vine and Drummond Matthews determined that new ocean floor was being produced at ocean ridges by examining ________
A) apparent polar wandering B) fossils in marine sediments C) glacial debris at various locations D) the location of ancient coral reefs E) the magnetic pattern of rocks on the seafloor
Places on Earth that have similar climates often support plants and animals with similar physical and physiological traits. The best explanation of this phenomenon is ________
A) divergent evolution B) migration of species C) convergent evolution D) speciation E) natural selection