Which events cause ferromagnetic materials to magnetize and which events cause them to demagnetize. sort events into the correct category.

answers !
magnetize;
1) place in magnetic field
2) pass electricity through
3) rub on permanent magnet

demagnetize;
1) heat
2)strike
3)place in opposite polarity

magnetize :

place in magnetic field,

rub on permanent magnet,

pass electricity through

demagnetize :

place on opposite polarity,

strike,

heat

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.