Carefully examine the relative positions of the lettered arrows in the diagram. Which letter corresponds most closely to the extinction of the dinosaurs?
A
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What is the approximate mixing time of the ocean?
A) 160 years B) 1,600 years C) 16,000 years D) None of these choices
The Inuit people are at greatest risk to the biomagnification of persistent organic pollutants because, within their ecosystems, the Inuit people are functioning as
A) primary producers. B) primary consumers. C) secondary consumers. D) decomposers and detritus feeders.
About 50 percent of the 125,000 km3 (30,000 mi3 ) of freshwater in lakes is
A) located in just seven lakes. B) located in the 40 largest lakes. C) in the Great Lakes. D) saline.
Violent tornadoes (with winds exceeding 180 knots) that contain smaller whirls rotating within them are called ____
a. multi-vortex tornadoes b. supercell tornadoes c. suction tornadoes d. tornado families e. tornado outbreaks