Magnetic field lines occur.. Around a wire which does not have current.
Around a current carrying wire.
In a wire
Vertical through the wire

They never intersect each other (if they do, it means that one pole is pointing in two directions). They start from North and terminate at South, outside the magnet, and vice-versa inside

answer: what are you talking about?

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.