The main constituent of the Martian atmosphere is:
A) hydrogen.
B) helium.
C) methane.
D) carbon dioxide.
E) nitrogen.
D
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What is the Hubble constant essentially a measure of?
a. the number of galaxies in the universe b. the expansion of the universe c. the age of the Milky Way galaxy d. the amount of dark matter in an average galaxy
The ozone layer is found within which of Earth's atmospheric layers?
A. ionosphere B. troposphere C. terrasphere D. stratosphere E. ozone layer
Most of the carbon dioxide on Venus
A) has frozen out in the polar regions B) is dissolved in oceans of liquid water, forming carbonate rocks C) is still present in the atmosphere D) has escaped into space
Suppose that a particular chemical substance is "pure" [contains no "impurities"], and that it is not possible to decompose this substance by chemical means. What can we conclude from this?
A) The substance must be a chemical compound. B) The substance must be an element. C) The substance must be one of the ideal, or perfect, gases. D) The substance must be incapable of entering into chemical reactions of any kind. E) None of the above.