If the conditions required for substantial amounts of oxygen to build up in a planetary atmosphere are quite rare, then life on other worlds
A) will probably not be present
B) will progress much more rapidly because there would be less oxidation
C) will progress at a similar rate as that on the Earth, except that it will remain anaerobic
D) may still be common but may never be able to evolve past microscopic forms
D
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State the physical meaning that the origin (0, 0) represents on the graph drawn in Procedure 2
The first minerals to crystallize are those having the
A) higher melting point. B) lower melting point. C) higher pressure. D) lower pressure.
Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
a. Enrico, because there really is only one kind of charge. b. Rosetta, because there really is only one kind of charge. c. Neither: although no charge is present originally, both types of charge are created through friction. d. Both: only one type of charge is created by friction at any one time. e. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.
Why didn't a planet form where the asteroid belt is now located?
A) There was not enough material in this part of the solar nebula to form a planet. B) Gravitational tugs from Jupiter prevented material from collecting together to form a planet. C) There was too much rocky material to form a terrestrial planet, but not enough gaseous material to form a jovian planet. D) The temperature in this portion of the solar nebula was just right to prevent rock from sticking together.