Which element is the world's lightest metal and increasingly a vital component of batteries used in small electronic devices?
A. lithium
B. mercury
C. iron
D. lead
E. silver
Answer: A
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Oil extraction may cause
A. acid drainage. B. black lung disease. C. land subsidence. D. All of the choices are correct.
A sound source of high frequency emits a high
A) speed. B) amplitude. C) pitch. D) all of the above E) none of the above
The bending of a wave in map view as it approaches a shoreline is called wave _______________
Fill in the blank(s) with correct word
Which of the following differences between warm-water and cold-water species is not directly caused by differences in water temperature?
A) Cold water organisms reproduce later and less frequently than those in tropical waters. B) Floating organisms are physically smaller in warm waters than in colder waters. C) Total biomass of plankton in the tropics is far less than that found in high-latitude waters. D) Tropical organisms grow faster and have a shorter life expectancy than those in colder water. E) Warm-water species often have ornate plumage which is absent in the larger cold-water species.