What may have prevented the use of bioplastics in the past century?
A. The technology for mass production of bioplastics was not yet available.
B. The materials needed for bioplastics was used for food.
C. Bioplastics were viewed as inferior materials.
D. Oil became widely available and petrochemical plastics took over the market.
E. Synthetic plastic producers had a strong government lobby.
Answer: D
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On a globe, the meridians converge toward the poles. Describe the pattern of meridians on the Mercator.
Compare the Mercator projection to a globe.
As planetesimals struck the growing Earth, their impact energy in combination with ________ melted the planet.
A. the greenhouse effect B. heat from the sun C. cosmic rays D. radioactivity E. energy left over from the Big Bang
Lake Chad, on the border of the Sahara Desert,
A. was originally a glacier that melted and so the water supply is dwindling. B. is a shrinking, shallow-water lake, depleted both by withdrawals for irrigation and by lack of recharge during a multi-decade period of declining rainfall. C. is a good analogy to Lake Erie, in that it has undergone extensive rehabilitation after being severely polluted and is now a healthy water source. D. is the last surviving deep-water lake in Africa and represents an important and stable water source for Chad, Niger, Nigeria and Cameroon.
When a heavy stone thrown straight up reaches the top of its path, its velocity is
A. zero and its acceleration is 10 m/s2. B. 10 m/s and its acceleration is zero. C. 10 m/s and its acceleration is 10 m/s2. D. zero and its acceleration is zero.