With a bar magnet where are the lines of force closest together?

The lines of force near the magnetic poles are close together.

Explanation:

The magnetic lines of force originates from the north pole and ends at the south pole. The lines of force form the closed curve. They can never intersect each other.

The lines of force near the poles are close together. The lines of force near the magnetic poles have highest density. The magnetic force is strongest at the poles and it is weaker at the center.

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.