This piece of evidence that was accidently discovered in the 1950's was key to widespread acceptance of the current theory about how the Universe formed.
A) Brightness and luminosity
B) Doppler shift
C) Background microwave radiation
D) The Big Bang
C) Background microwave radiation
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Which of the following geologic observations would bear directly on working out the sequence of geologic events in an area?
A) mineral analysis of schist B) grain size comparison between sandstone and shale C) an unconformity between a granite and a sandstone D) the feldspar and quartz contents of a granite
The United States has enormous quantities of oil in ________.
A. oil shale B. limestones C. tar sands D. hydrothermal veins E. gas hydrates
When populations of two different species interact over time in a way that drives changes in their gene pools, it can be said that __________________ occurs
Fill in the blanks with correct word
Dunes formed when strong winds break through transverse dunes to make new dunes whose ends point upwind are called
a. longitudinal dunes b. star dunes c. barchan dunes d. parabolic dunes