Why is that absolute magnitude of some stars greater than their apparent magnitude

Which measure of humidity, relative humidity or dew point, best describes the actual quantity of water vapor in a mass of air

Physical features of central america look at the map above which of the following is true

All of the following came out of china and were exchanged along the silk road, except a. papermaking b. block printing c. buddhism d. compasses select the best answer from the choices provided a b c d