Which type of rock solidifies from molten magma?
a) igneous rock
b) sedimentary rock
c) metamorphic rock
d) cross-bedded rock
a
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Which of the following is a vector quantity?
A) area B) volume C) mass D) none of the above
Perhaps the greatest of the Greek astronomers, ________ compiled the first catalog of stars, accurately measured their positions, and defined the basic system of stellar brightnesses
A) Erastothenes B) Aristotle C) Ptolemy D) Hipparchus E) Aristarchus
A figure skater spins with her arms extended. When she pulls in her arms, she spins faster because
A. she has decreased her rotational inertia. B. she has increased her rotational inertia. C. she has increased her angular momentum. D. the ice exerts a torque on her skates.
Of EM waves having these wavelengths, which would be visible?
a. 100 nm b. 500 nm c. 1000 nm d. 1 nm e. none of the above