What is the chief problem associated with the use of groundwater in Southwest Asia and North Africa?
A) Groundwater is highly polluted by agricultural chemical runoff.
B) Groundwater is being depleted faster than it can be replaced, so it is inherently unsustainable.
C) Groundwater in this region is often contaminated with crude oil.
D) Drilling wells is very expensive.
E) All of the choices are correct.
B
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According to Aristotle, a rolled ball eventually comes to a stop because
A. it seeks its natural state of rest. B. of inertia. C. of friction. D. all of the above
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%
In 2016, floods were responsible for about 40% of the fatalities.
Answer the following statement true (T) or false (F)
The ________ marks the transition between the continental crust and the oceanic crust.
A. continental shelf B. continental rise C. abyssal plain D. continental slope