A crane raises a crate with a mass of 150 kg to a height of 20 m. Given that the acceleration due to gravity is 9.8 m/s2, what is the crate's potential energy
at this point?
O A. 720
B. 294,000 J
O C. 29,400 J
O D. 306 J

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.