less than 1% of all the earth s water is readily available for human consumption. in the semi-arid desert plains of the southwest united states where rainfall averages just 2 1/2 centimeters per month, tom maddock studies this scarce resource. dr. maddock: the real problem that we have is that with increasing populations and shortages of water we are becoming very vulnerable. in the southwest, there s a very unique vulnerability here, simply because where do we get the water if there is no water? narrator: across the country in northern florida, the quantity of water isn t an issue. rainfall averages an abundant 1 1/4 meters each year. wendy graham and her colleagues evaluate and model the impacts of industrial and agricultural land use threatening the world s largest collection of freshwater springs. dr. graham: right now, the biggest question is how far we can stress the system and not push it past the point of no return. narrator: both researchers are working towards a sus
what i d like to do now is start with the tenor section, then the alto and the soprano, and then i ll add the bass. one, two, three, and jesus is a rock in a weary land. (narrator) the subject of musical texture raises a number of questions. how are the different voices or instruments in a performance put together and organized? let s add the altos, altos, tenor, and bass, ready jesus is a rock in a weary land. (narrator) how many parts are there? does one voice or melody stand out? how do the various parts relate to each other? one more time, without piano. jesus is a rock in a weary land. (man) any music is a set of preferences, we like it like that. this is how we think things go together, okay. and people really have strong preferences in terms of something like texture. there are large regions where people really only like to hear one or two things happening at the same time. there are other places where people seem to feel that s not enough. they want a real
and shortages of water, we are becoming very vulnerable. in the southwest, there s a very unique vulnerability here, simply because where do we get the water if there is no water? narrator: across the country in northern florida, the quantity of water isn t an issue. rainfall averages an abundant 1 1/4 meters each year. wendy graham and her colleagues evaluate and model the impacts of industrial and agricultural land use threatening the world s largest collection of freshwater springs. dr. graham: right now, the biggest question is how far we can stress the system and not push it past the point of no return. narrator: both researchers are working towards a sustainable future to protect the water needed by our species and our planet. arizona is one of the fastest-growing states in the u.s. the consequent demand on freshwater for personal, industrial, and agricultural use is depleting the natural resource and destroying the environment. i m tom maddock. i m at the university of
in the semi-arid desert plains of the southwest united states where rainfall averages just 2 1/2 centimeters per month, tom maddock studies this scarce resource. dr. maddock: the real problem that we have is that with increasing populations and shortages of water we are becoming very vulnerable. in the southwest, there s a very unique vulnerability here, simply because where do we get the water if there is no water? narrator: across the country in northern florida, the quantity of water isn t an issue. rainfall averages an abundant 1 1/4 meters each year. wendy graham and her colleagues evaluate and model the impacts of industrial and agricultural land use threatening the world s largest collection of freshwater springs. dr. graham: right now, the biggest question is how far we can stress the system and not push it past the point of no return. narrator: both researchers are working towards a sustainable future to protect the water needed by our species and our planet. arizona
[low hum and sticks clacking] [cultural music montage] [keyboard plays light jazz music] (man) harmony can best be described as notes sounding together in combination; pitches that are stacked on top of one another. if we hear only a melody by itself, with no harmonic accompaniment, it might sound something like this. [plays melody line from we three kings ] now if we hear an accompaniment to it, this would be considered harmonizing the melody. this hand is going to play the harmonic accompaniment. this hand will play the melody again. (man) if you look at harmony as the sounding of a number of musical notes at the same time, it s not a phenomenon that is confined to europe or the united states. it happens in a million different ways all around the world. in indonesia, in gamelan music, you have a kind of harmony because you have notes that are tuned together that are being sounded simultaneously. [ensemble plays gamelan music] in zimbabwean mbira music, there is a kind of h