Some Jovian moons may have liquid water
A) beneath their surfaces
B) at their centers
C) on their surfaces
D) in their atmospheres
A
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The radioactivity due to carbon-14 measured in a piece of a wooden casket from an ancient burial site is found to produce 20 counts per minute from a given sample,
whereas the same amount of carbon from a piece of living wood produces 160 counts per minute. The half-life of carbon-14, a beta-minus emitter, is 5730 years. What would we calculate for the age of the artifact, assuming that the activity for living wood has remained constant over time? A) 5,700 years B) 11,500 years C) 14,800 years D) 17,200 years E) 23,000 years
Which of the following is not key evidence in support of the idea that all life today shares a common ancestor?
A) We have identified fossils of the first life forms that ever existed on Earth. B) All life uses DNA and the same genetic code. C) Mapping of gene sequences shows how life is all related. D) All life builds proteins from the same amino acids and uses ATP to store energy in cells.
Which of the following ions is isoelectronic with a neon atom?
a. N3- b. Li+ c. Cl- d. F2-
The ecliptic plane is
A) the plane of Earth's orbit around the Sun. B) the plane of the Moon's orbit around Earth. C) the plane of our solar system's orbit around the Milky Way Galaxy. D) a flat disk of material that lies between the Sun and Earth. E) the plane defined by Earth's equator.