Which is a characteristic of thermal energy transfer through convection? A

Heat is transferred by the collisions of electrons within a solid.

B

Heat is transferred by the collisions of molecules, atoms, and electrons within a solid.

C

Heat is transferred by the emission of electromagnetic waves from a substance.

D

Heat is transferred by the bulk movement of atoms and molecules which forms currents within liquids and gases.

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.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

amplitude

hope this