The Giant-Impact Hypothesis suggests that 4.5 billion years ago a Mars sized proto- planet named Theia collided with the earth ejecting enough matter into space to coalesce and form the moon. Theia was traveling 4.2 km/s and was 0.45 the mass of the earth when it collided. Assuming earth to be the inertial frame of reference, what was the resulting linear velocity of the Earth-Moon system after the collision?

trig 15.3 cos

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.

pretty sure it's false