The volume or intensity of a sound wave is measured by the size of the and reported in decibels. A) amplitude
B) frequency
C) trough
D) wavelength

A.) amplitude (amplitude equates to the volume of a sound wave, frequency equates to the note that is played)

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d