________% of the food we consume comes from ________ crop species
A) 50; 20 B) 90; 15 C) 90; 100 D) 10; 100 E) 50; 50
B
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About 1.5 million Americans get sick annually from fecal contamination producing large health costs. Preventive measures would cost
A. slightly more. B. about the same. C. less. D. much more.
What is true of Iceland?
A) Iceland is contracting at a rate of about 4 mm per year due to melting at the Mid-Atlantic Ridge. B) Iceland is stretching at a rate of about 4 mm per year due to expansion at the Mid-Atlantic Ridge. C) Iceland is contracting at a rate of about 4 m per year due to melting at the Mid-Atlantic Ridge. D) Iceland is stretching at a rate of about 4 m per year due to expansion at the Mid-Atlantic Ridge.
The GDP and GPI/ISEW include calculations of the
A) labor that goes into housework, parenting, and volunteer work. B) cost of pollution. C) cost of crime. D) income from the sale of natural products.
In order to control flooding, levees are frequently constructed along the banks of rivers to confine flow to the channel. Given this, what happens to the flow velocity and erosive power of the stream during a flood, before the water overflows the levee?
a. Velocity increases because the width does not increase, and the erosive power increases. b. Velocity increases because depth does not increase, and the erosive power increases. c. Velocity decreases because the depth of the channel is significantly greater, and the erosive power increases. d. Velocity decreases because the width of the channel is significantly less and the erosive power decreases.