The polar jet stream is strongest and moves furthest south in the ____
A) winter
B) spring
C) summer
D) fall
A
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In science, especially physics, an educated guess is called a
A. fact. B. theory. C. both a fact and a theory. D. none of the above
What led to a spike in world wheat prices in 2010?
A. the Russian invasion of Georgia B. a heat wave that resulted in the Russian government's decision to ban wheat exports. C. the Common Wealth of Independent States' (CIS) attempt to corner the wheat market. D. Russia joining the World Trade Organization.
Air pollution is best defined as ________
A) suspended particles of gases that contain small amounts of solids and liquids B) gases or particles present in high enough concentrations in the atmosphere to harm humans, other organisms and structures C) any gases in Earth's atmosphere in trace amounts D) small particles in the atmosphere arising from volatile organic compounds E) organic chemicals that can vaporize into the air
To make use of most renewable energy resources, we must ________
A) capture and convert these diffuse energy sources into more concentrated forms B) further explore the tropical rainforests for natural products that will aid in these new technologies C) convert the concentrated nature of these natural resources to more usable forms D) solve the negative environmental impacts of these renewable energy resources E) persuade government officials of their abundance