Radiometric dating of a rock reveals an age of 1.52 billion years. Given that the half-life of the parent isotope used is 14.0 billion years, what percentage of the parent isotope is still present in the rock?
A) 92.8%
B) 10.9%
C) 76.4%
D) 7.26%
A
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Which of the following provides evidence that all life on Earth shares a common ancestor?
A) All life on Earth shares certain biochemical similarities, including use of DNA as its hereditary molecule. B) All life on Earth requires energy and nutrients to survive. C) All life on Earth requires liquid water to survive. D) All life on Earth shares similarities in appearance that could not possibly be a coincidence.
How have astronomers interpreted the unexpectedly fast rotation of galaxies?
A.) Scientific measurements must be wrong. B.) Galaxies may be breaking up. C.) There must be a lot of dark matter whose gravity can be felt but not seen. D.) These galaxies must have had collisions. E.) B, C, and D.
The astronomical object in our sky which plays the most fundamental role in our lives is the
A) Sun B) Moon C) nearest star D) most massive planet in our solar system, Jupiter
On a floodplain, the sediment grains away from the main river channel are
A) coarse-grained sand and gravels. B) fine-grained silts and clays. C) well-sorted and well-rounded sand particles. D) all of these