It appears that, as the number of sunspots increases, the sun's total energy output:a
increases slightly
b. decreases slightly
c. begins to alternately increase and decrease above average values
d. does not change
a
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Astronomers who subscribe to the Big Bang theory believe the Big Bang occurred
A. at the beginning of time. B. about 15 billion years ago. C. both of these D. neither of these
Small, single-celled autotrophs covered with disks of calcium carbonate fixed to the outside of their cell walls are
____________. Fill in the blank(s) with the appropriate word(s).
Jet streams:
A) are usually about ten miles wide. B) were first detected by George Hadley. C) occur about 2-12 kim above the surface in middle latitudes. D) reverse direction 180 degrees in summer. E) do not go below 50 degrees latitude.
Vertical zonation shows that not only do different biomes occur at different latitudes, but also at different ________.
A. right ascensions and declinations B. longitudes C. altitudes D. seasons