I'll give brainliest to the best answer 1.what is gravity? 2.what is the difference between distance and contact forces?   what would be an example of each? 3.describe two factors that are needed to calculate speed. 4.hypothesize what might occur when a positive charged magnet is placed next to a negative charged magnet.   what might happen when a positive charge is placed next to a neutral charge? 5.sally is trying to lift a heavy box, but is not strong enough to lift it.   would the force that she is applying to the box be an example of an unbalanced force or a balanced force?   why?

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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.