Show 0 J Underground w Water te 1 j Ii T IlS age ge of oT gasoline consumption and J hd for for oil fuel little littie is thought or orr orr orthe r r fihe the rich pools of pure wat water r within e eo poel of of the earth from whence most or ort t all alt of ol the water supply for domes- domes U poses comes and much of the supply edv fr irrigation Study of the oil pools r ih the h geology from which the fluids are aret t ined ned is becoming more general and com com- 1 ace as ts' ts e every ery possible structure 7 oU being prospected But after all the t rr ljean waters in the Un United ted States are iMore more importance than the subterranean oil pis for without the waters the country I uld ld be a a barren barren- desert Th The geological survey of the United States been en studying the underground water ces Q pf f the country for fr m many ny years and ore th than n 20 papers have been published on fife subject Gravel is the best kind of form form- nn n to carry and yield water In hl the United afes e one ne rep report rt states tates gravel supplies u plies the j wt t r to most strong wells furnishing more water ter to wells than all other materials taken ether A well that t. t ends ih in a q good b hd d I- I grayel may yield more than a thousand gallons ns m minute ut ute Next to gravel come come 5 sand Saud sandstone sandston r. r lith limestone stone and d basalt in the in-the the e order Ii p named The T e ost completely Q pl t unproductive rP o v mate materials ls v ar are the r truex clays clays' lay a and nd fine M silts j j I k t. t W i. i t iy rj tf 1 n i ii 4 t 1 Mi fi h. h J- J f which ar are too too soft soft to have joints or other open spaces s and and whose pores Pores are too minute to yi yield ld water The rocks that form the crust of the earth are not solid throughout but contain able ho holes boles es or pen open places which range ronge in size from minute pores to huge caverns These open spaces s both large larEe and small are underground underground underground under under- ground r reservoirs that feed springs and wells and furnish sh the water supply for mankind Therefore the character and distribution of the rocks determine occurrence of ground water in any region Because water is so common common where most people populate little heed is given as to th the source but when a tr traveler gets into a dry desert and pangs of thirst begin to parch his throat then he may well thank natures nature's rock formation that has caused the little oasis where appears a small trickling of water to the coming surface from some geological formation far ar underground that not only made the collection of water in some subterranean cavern possible but made possible possible possible pos pos- sible i its s finding its way to the surface for mankind |