Who is responsible for enforcing water quality standards?
A. the Clean Water Act
B. Department of Homeland Security
C. the EPA
Answer: C
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A population growth rate of 1% means a population will double in 70 years (70/growth rate). China's growth rate is 0.65%, which means
A. its population of 1.3 billion will reach 2.6 billion by 2080. B. at the current rate, its population would double in 108 years. C. the population has already begun to decrease from its peak 1.31 billion. D. China needs to reconsider its one-child policy
Different isotopes of the same element differ from each other in that they have different ____________________ numbers
Fill in the blank(s) with correct word
Knowing the importance of assessing coal reserves in terms of energy content per unit weight, which region has the most valuable coal reserves?
A) Africa B) Australia C) Europe D) Asia E) South America
Between World Wars I and II, The United States ________
A) Was a member of the League of Nations, and played a major role B) Was not a member of the League of Nations, and played a major role C) Was a member of the League of Nations, and did not play a major role D) Was not a member of the League of Nations, and did not play a major role