What is differentiation in planetary geology?

A) the process by which gravity separates materials according to density
B) the process by which different types of minerals form a conglomerate rock
C) any process by which a planet's surface evolves differently from another planet's surface
D) any process by which one part of a planet's surface evolves differently from another part of the same planet's surface
E) any process by which a planet evolves differently from its moons


A

Physics & Space Science

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(a) Linearly dependent upon temperature. (b) Independent of temperature. (c) A nonlinear function of temperature. (d) Inversely dependent upon temperature.

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A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 1000 m from the source is (in dB)

A. 62.8. B. 66.0. C. 68.5. D. 70.5. E. 72.0.

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In terms of dark, smoother maria and cratered highlands, which Jovian moon most resembles the near side of our own?

A) Titan B) Io C) Europa D) Triton E) Ganymede

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A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the source the intensity level is 51 db

What is the total acoustic power output of the source, in watts? (Note: The reference intensity I0 is 1.0 × 10-12 W/m2.)

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