the geothermal gradient, on average, is about _____.
What will be an ideal response?
30 C/km
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Which of the following is a characteristic of polyaquaculture?
a. Only herbivorous fish are raised. b. Only carnivorous fish are raised. c. Fish and shrimp are raised in ponds along with algae, seaweed, and shellfish. d. Fish are raised in estuaries where the flushing action of rivers keeps the wastes moving away from the fish. e. Multiple kinds of shellfish (crab, shrimp, mussels) are raised in the same pond.
How many separate sites of seismograph recordings are required to locate the center of an earthquake?
a. ?one b. ?two c. ?three d. ?four e. ?five
The event that marks the birth of the modern electronics industry is the invention of the ________
A) telegraph in 1838 B) telephone in 1876 C) moving pictures in 1877 D) radio in 1901 E) transistor in 1948
GPS was developed by the military
Indicate whether the statement is true or false