What are the most common sources of groundwater contamination? What will be an ideal response?
Sewage, landfills, toxic waste disposal sites, and agriculture.
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Ocean currents play a relatively small role in regulating climate
Indicate whether the statement is true or false
Krypton-85 has a half-life of 10. years. Approximately what percentage of Kr-85 produced from the Chernobyl accident in 1986 still remains radioactive in 2010?
A) 25% B) 12% C) 6% D) 3%
What is the correct tool to tighten a hard suction hose connection?
a. rubber mallet b. spanner c. hose wrench d. strap wrench
Despite increased agricultural production by developed countries about 100 years ago, less developed countries continued to use traditional agricultural practices. Then, in the 1960s, the research of Dr. Norman Borlaug increased crop production by nearly 500% in Mexico and India by using __________.
a. modern farm equipment b. disease resistant crops c. high yielding crops d. All of the above responses are correct.