As they travel on the open sea, tsunamis ________.
A) have very short wavelengths
B) can be as tall as 30 meters
C) become taller and taller
D) are inconspicuous
E) move at speeds of 5-10 kilometers per hour
Answer: D) are inconspicuous
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The potential problem with natural decay for human waste is that
A. It is an expensive process to maintain B. Unlike sewage treatment, it produces toxic by-products C. Natural processes take a long time D. It never really works E. It only works where population density is low
The forces that hold atoms and ions together to form molecules are:
1.Chemical bonds. 2.Negative bonds. 3.Positive bonds. 4.Neutral bonds.
In the South in 2011, ________ percent of Asians lived in poverty
A) 9.9 B) 10.4 C) 24.7 D) 26.7
Which source of drinking water is most likely to be pure and safe to drink?
A. bottled spring water B. municipal water C. river water D. spring water