Science, Том 109John Michels (Journalist) American Association for the Advancement of Science, 1883 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 53
... material over millions of years , al- tering its chemical structure to give a greater percent- age of combustible carbon , and storing it , so that we can have convenient fossil fuels packaged as solids , liquids , or gases - coal to be ...
... material over millions of years , al- tering its chemical structure to give a greater percent- age of combustible carbon , and storing it , so that we can have convenient fossil fuels packaged as solids , liquids , or gases - coal to be ...
Стр. 69
... material is a hard , cellular , slaglike " ironstone , " ranging in color from red to yellowish brown and dark brown . In Gage County this material overlies reticulately mottled red and light - gray kaolinite clay beds of the Dakota ...
... material is a hard , cellular , slaglike " ironstone , " ranging in color from red to yellowish brown and dark brown . In Gage County this material overlies reticulately mottled red and light - gray kaolinite clay beds of the Dakota ...
Стр. 636
... material less than about 35,000 years old . Such material includes , among other substances , buried soils , wood , charcoal , bone , and calcareous shells . If adequate amounts of this material are collected from horizons of accurately ...
... material less than about 35,000 years old . Such material includes , among other substances , buried soils , wood , charcoal , bone , and calcareous shells . If adequate amounts of this material are collected from horizons of accurately ...
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