15. to use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your a. forefinger in the direction of the motion. b. forefinger in the direction of the lines of force. c. thumb in the direction of the electromagnetic force. d. thumb in the direction of the magnetic flux.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

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