The crude birth rate is the number of live births per _____ persons in a given year
a. 50
b. 100
c. 500
d. 1,000
e. 10,000
D
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Human activities can greatly accelerate ____________________ by increasing the rate at which nitrate- and phosphate- containing effluents enter aquatic ecosystems from their surrounding watersheds.
Fill in the blank(s) with the appropriate word(s).
Why does air flow into the center of a cyclone?
A) The center of a cyclone is a region of cold air. B) The center of a cyclone is a region of high air pressure. C) The center of a cyclone is a region of low air pressure. D) The center of a cyclone is near Earth's surface.
The Superfund, established to clean up hazardous waste sites in the United States, is a part of the ________
A) Superfund Authority Act B) Comprehensive Environmental Response, Compensation, and Liability Act C) Hazardous Waste Management Act D) Superfund Management and Liability Act E) Resource Conservation and Recovery Act
A scientific law is a brief statement illustrating a basic principle that has been repeatedly supported with observations and measurements
Indicate whether the statement is true or false