What evidence supports the hypothesis for a vast, deep ocean which once occupied what is now the northern plains of Mars?
A) many of the largest flood channels appear to have drained into the northern plains
B) geographic features that look like ancient shorelines
C) that the rock along the proposed shoreline is sedimentary rather than volcanic
D) all of these are evidence
D
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Atomic Nucleus: The symbol for a certain isotope of radium is 
Ra. How many nucleons are there in the nucleus of this isotope?
A. 88 B. 138 C. 214 D. 226 E. 314
One of the discoveries made by the Voyager probes while near Jupiter was:
A) Io has a featureless surface that never changes. B) a thin ring of dust around the equator. C) the absence of a magnetic field around the giant planet. D) that the Great Red Spot is uniform and featureless. E) each of the four large moons produces a strong magnetic field.
Which of the following developed the theory that the planets circle the sun rather than circling Earth?
A) Copernicus B) Kepler C) Ptolemy D) Brahe E) Galileo
A stretched string can have ______________ natural frequency(ies)
a. one b. 10 times its length in c. 5 times its length in d. many