Sinusoidal water waves are created 120 km offshore by an earthquake near a small island. observers in helicopters above the island report that the waves have an amplitude of about 2.0 m, a wavelength of 15 m, and a frequency of about 0.5 hz. how long do lifeguards on the mainland have to evacuate beaches before the waves arrive?

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.