The compositions of the planets
A. are all very similar, so other planets may be able to support life or provide needed resources.
B. were determined by the distance from the sun at which each formed, except for the largest planets.
C. are entirely unknown; geologists cannot judge their similarity to earth.
D. were originally all the same but have been changed by radiation from the sun over the life of the solar system.
Answer: B
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The subsolar point
A) never moves more than 23.5 degrees in a year. B) is at the Tropic of Cancer on the June solstice. C) reaches above the Arctic Circle only in summer. D) is independent of the solar declination.
Which reptile group is considered to have been the ancestor for the mammals?
a. captorhinomorphs b. pelycosaurs c. Edaphosaurus d. Hylonomous e. alligators
The Sun's radiant energy reaches the Earth across space in approximately ________
A) 8 seconds B) 8 minutes C) 8 hours D) 8 days E) 8 months
The most influential American forester was Aldo Leopold.
Answer the following statement true (T) or false (F)