What is a primary source of mercury fallout in the U.S. today?
A. Coal-fired power plants
B. No-till agriculture
C. Testing of nuclear weapons
D. Launches of spacecraft
Answer: A
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Excepting Hong Kong (which is 100% urban) which nation is the most urban in East Asia?
A) Japan
B) South Korea
C) Taiwan
D) China
E) North Korea
On average, each person in the U.S. produces between 4 and 5 pounds of trash every day. Indicate whether the statement is true or false
Desert locations cool off rapidly at night due to the high specific heat of sand
Indicate whether the statement is true or false
Important requirements for hail to form are ________.
A. upper-level cold air creating maximum temperature contrasts B. strong updrafts to keep hailstones suspended while adding coatings of ice onto ever-growing cores C. large thunderstorms with buoyant hot air rising from heated ground D. All of these choices are correct. E. None of these choices are correct.