How did Niels Bohr change the atomic model based on his experimental results?
A. He described the atom as a sea of positive charge sprinkled with
electrons,
B. He placed positive material in the atom's center,
C. He placed electrons in orbits around the nucleus.
D. He described electrons as being in clouds outside the nucleus.

C. He placed electrons in orbits around the nucleus

Explanation:

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.

i think the answer is a, hope this : )