Earth is the only planet in the solar system known to have plate tectonics
Indicate whether the statement is true or false
TRUE
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An automobile engine operates with an overall efficiency of 12%. How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned?
a. 1.2 b. 8.8 c. 6.5 d. 4.7 e. 7.5
Pluto is smaller than many moons in the solar system
Indicate whether the statement is true or false
The "rare Earth hypothesis" holds that Earth-like planets will prove to be quite rare. Which of the following statements best sums up the current status of the debate over this hypothesis?
A) It is no longer discussed, because as part of its broad cover-up of UFOs, the United States government has classified all the material relating to this debate as Top Secret. B) We do not have enough data to settle the debate, because counterarguments can be made for each argument suggesting Earth-like planets may be rare. C) The debate raged for a while, but is now settled. We are now quite certain that Earth-like planets are rare. D) The debate raged for a while, but is now settled. We are now quite certain that Earth-like planets are common.
Retrograde motion of a planet refers to ______________ motion
a. west-to-east b. east-to-west c. circular d. elliptical