The greatest increase in the speed of a sound wave would result from the transition between which two media?

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

Why is immigration so important today?

Plz in a major hurry will give brainlest asapwhich of these would best describe the process labeled p? absorption of heat absorption of elements formation of solar energy formation of new elements