A Maglev train is powered by magnetism and electricity. A student wants to build a model of this train. Which test will best determine if the model train works? Attach the train to an electric fan
Connect the train to a solar panel
Connect the train to an electromagnet
Connect the train to a rocket

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.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

a. spokes of a wheel.

as indicated in the question radial contains rad, also found in radius, so the fracture's would span the radius.