An apple breaks off from its branch and falls toward the ground 9 m below, accelerating all the way. At point S the apple is 6 m from the ground. At point T the apple is 3 m from the ground. How does the sum of the gravitational potential and kinetic energies of the apple compare between point S and point T?

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.

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank