Which of the following light sources is the most efficient?
A. incandescent
B. LED
C. sodium vapor
D. candle
Answer: D
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The sudden increase in oil and gas production by fracking in the United States was enabled by two technologies: hydraulic fracturing and ____.
A. liquefied natural gas ships B. cargo helicopters C. digital water pumps D. GPS E. horizontal drilling
How does water have such strong surface tension?
a) Water molecules are constantly bumping against each other, creating strong surface tension. b) Water is the universal solvent, and so has extremely strong surface tension. c) Hydrogen bonds form between adjacent molecules due to water's polarity, thus giving it strong surface tension. d) Water has high kinetic energy, resulting in strong surface tension.
Mt. Etna lies in the European region's major tectonically active zone and youngest mountain range. You can infer that Mt. Etna is in the ________ Sea
A) North B) Mediterranean C) Baltic D) Celtic
Metamorphism is a physical and chemical change that occurs in such a way that:a
disequilibrium is reached with the new physical and chemical environment. b. a dynamic equilibrium is reached. c. equilibrium with the new environment is disturbed. d. the rock reaches equilibrium with its new environment. e. the rock's chemistry and texture become increasingly unstable