To determine the speed of a wave, you would use which of the following formulas? a. speed = frequency x amplitude b. speed = wavelength x frequency c. speed = wavelength x amplitude d. speed = wavelength x period user: which part of the ear amplifies the vibrations from sound waves? a. outer ear b. inner ear c. middle ear d. both a and b

see earlier

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.