Why does a plume of contamination spread out (become wider) away from the source of contamination?
A) Because the water flows faster and faster
B) Because of diffusion of the contamination and mixing of contaminated and uncontaminated water
C) Does not spread out away from the source
D) Will only spread out if it is close to a cone of depression
B) Because of diffusion of the contamination and mixing of contaminated and uncontaminated water
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In metropolitan areas around the world, ________ is (are) critical in supporting food security for around 800 million
A) urban agriculture B) U.S. food aid C) CSAs D) the food chain E) NTAEs
The Earth's magnetic field is generated by
A. convection currents in the asthenosphere. B. aligned magnetic minerals within Earth's inner core. C. salty water moving through the deep parts of the crust. D. movement of iron and electrical currents within Earth's outer core.
In which of the following time periods were dinosaurs the dominant creatures?
A. Mesozoic B. Precambrian C. Cenozoic D. Paleozoic
Should government spend billions of dollars developing new, cleaner ways to burn coal?
a. Yes, it is worthwhile. Coal is an abundant resource that can help meet our nation’s energy demands. b. Yes, but money should also be spent developing renewable energy resources. c. No. We should discontinue burning coal immediately. d. No. I believe that coal companies should finance cleaner technology, not the government.