The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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النتائج 1-5 من 81
الصفحة xxi
... Land capable of use for crops 9. Utilization of the land area of the United States 232 248 249 10. Potential uses of land area of the United States 251 11. Average yields per acre , 1909-1913 , of seven important crops in four European ...
... Land capable of use for crops 9. Utilization of the land area of the United States 232 248 249 10. Potential uses of land area of the United States 251 11. Average yields per acre , 1909-1913 , of seven important crops in four European ...
الصفحة 19
... land and water areas presents some interesting problems . The present positions of the oceans and continents have been more or less permanent throughout all the time which geologists can measure . Yet there is evidence that shallow seas ...
... land and water areas presents some interesting problems . The present positions of the oceans and continents have been more or less permanent throughout all the time which geologists can measure . Yet there is evidence that shallow seas ...
الصفحة 20
... land surface of the United States is being lowered at the rate of an inch in 760 years . All over the earth the same thing is happening . Slow as the rate may seem , the total amount carried to sea from the United States yearly is ...
... land surface of the United States is being lowered at the rate of an inch in 760 years . All over the earth the same thing is happening . Slow as the rate may seem , the total amount carried to sea from the United States yearly is ...
الصفحة 21
... land and transferred it to the ocean has required from one to two hundred million years . Great Salt Lake in Utah is but the salty remnant of the vast fresh - water Lake Bonneville whose waters once flowed north through the Bear River ...
... land and transferred it to the ocean has required from one to two hundred million years . Great Salt Lake in Utah is but the salty remnant of the vast fresh - water Lake Bonneville whose waters once flowed north through the Bear River ...
الصفحة 22
... be carried away and the land rendered sterile . Of the 272 pounds mentioned above as taken from each acre about 5.79 22 THE PHYSICAL BASIS OF SOCIETY The Metals Iron Supply Iron Alloys Steel Iron Production Copper Zinc Aluminum Lead.
... be carried away and the land rendered sterile . Of the 272 pounds mentioned above as taken from each acre about 5.79 22 THE PHYSICAL BASIS OF SOCIETY The Metals Iron Supply Iron Alloys Steel Iron Production Copper Zinc Aluminum Lead.
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
acres Africa alloy America appears areas Asia atoms average bacteria birds black bass body carbon carbon dioxide cattle cause cells Cenozoic cent century changes chemical chlorophyll climate coal common compounds crops cultivated culture death rate destroy disease distribution domestic animals early earth eaten eggs elements enemies Europe evidence fact fish forms germ germ cells hawk heat horse human hydrogen Ibid important increase Indian insects iron killed known land later light live man's metals mice migration miles moth native nature neolithic nitrogen ocean organisms oxygen Pará rubber tree parasites plants and animals population pounds produce protoplasm R. S. LULL race regions rodents season seeds seems sharp-shinned hawk sheep soil South South America species square mile substances sugar supply surface survive tarpan temperature thousand tion to-day trees tropics types United wild