Have your mother and father (or any adult man and woman) sing together on the same note, at the same pitch (not an octave apart)
. Write down any differences you can hear. Is one voice lower or higher sounding (even though they are singing the same pitch)? Are there other differences you can hear? Explain your results using the terms “overtones,” “frequency,” “pitch,” and “sound quality.”
No one sounds the same in singing everyone has a different pitch, overtones, and sound quality. Now in some songs people harmonize together and that can sound the same in pitch but there are still different pitches and tones.
(1) Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei. ... (3) Rates of chemical reactions are influenced by temperature and catalysts.
The idea is that all continents move at a rate of approximately 2 inches per year because their moving ever since pangea (all continents were one) separated
