Which of the following best describes the Earth's average surface temperature for the past 900,000 years?
a. a steady warming trend
b. fairly steady temperatures until recently
c. many fluctuations of several degrees centigrade
d. fairly steady with occasional cool spells
e. fairly steady with a recent cooling trend
C
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The prime meridian and the equator are both lines of latitude
Indicate whether this statement is true or false.
________ clouds have a circular shape and form downwind of mountain barriers
Fill in the blank(s) with the appropriate word(s).
Air masses are classified according to the ________ and ________ characteristics of their source regions
Fill in the blank(s) with the appropriate word(s).
In what form(s) will a carboxylic acid, RCOOH, be present if the pH of an aqueous solution is adjusted to be the same as the pKa of the acid?
A) primarily as RCOOH (aq) B) primarily as RCOO- (aq) C) equal amounts of a and b D) neither a nor b