Farm Development: An Introductory Book in Agriculture, Including a Discussion of Soils, Selecting & Planning Farms, Subduing the Fields, Drainage, Irrigation, Roads, Fences, Together with Introductory Chapters Concerning Farm Business, and the Relations of General Science to AgricultureOrange Judd Company, 1910 - 391 páginas |
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Página 33
... covered by natural history . There are several theories as to how our planet came to have the shape and size that it has , but there is much evidence that in the beginning the earth was very hot . According to this theory , part of the ...
... covered by natural history . There are several theories as to how our planet came to have the shape and size that it has , but there is much evidence that in the beginning the earth was very hot . According to this theory , part of the ...
Página 35
... covered with clay , in some cases have been gradually transformed into coal . In other places , where the surface of the earth is com- posed of solid rock , of hard stones , or even of gravel or sand , which does not easily decay ...
... covered with clay , in some cases have been gradually transformed into coal . In other places , where the surface of the earth is com- posed of solid rock , of hard stones , or even of gravel or sand , which does not easily decay ...
Página 37
... covered by the great glacier . The Mississippi valley was then much as it is now , the ele- vated plains toward the Rocky Mountains preventing the ice sheet from flowing in that direction . The higher land at the foot of the Alleghanies ...
... covered by the great glacier . The Mississippi valley was then much as it is now , the ele- vated plains toward the Rocky Mountains preventing the ice sheet from flowing in that direction . The higher land at the foot of the Alleghanies ...
Página 38
... covering the underlying rocks of the region over which the glacier flowed . The ice , in flowing over this surface , gathered up much of the loose clay , sand and stones , and also tore loose and ground up more of the underlying rocks ...
... covering the underlying rocks of the region over which the glacier flowed . The ice , in flowing over this surface , gathered up much of the loose clay , sand and stones , and also tore loose and ground up more of the underlying rocks ...
Página 40
... covered with vegetation and so filled with decaying organic substances , that they retain water very well and nourish large crops . Even gravelly soils where moisture is abundant , are gradually so changed that they raise crops of ...
... covered with vegetation and so filled with decaying organic substances , that they retain water very well and nourish large crops . Even gravelly soils where moisture is abundant , are gradually so changed that they raise crops of ...
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Farm Development; An Introductory Book in Agriculture, Including a ... W. M. Hays Sin vista previa disponible - 2017 |
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