The New Book of Knowledge, Volum 1Grolier Incorporated, 1989 - 21 sider An illustrated encyclopedia containing over 9000 articles on history, literature, art and music, geography, myths and legends, mathematics, science, hobbies, holidays and festivals, games, sports, crafts, medicine, law, government, industry, politics, and other topics. |
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Side 88
... modern agriculture . 88 · DR INCER foods that grow underground as roots and tu-. AGRICULTURE When you think about agriculture , do you picture a farmer driving a large tractor across a huge field ? If you do , you will be partly correct ...
... modern agriculture . 88 · DR INCER foods that grow underground as roots and tu-. AGRICULTURE When you think about agriculture , do you picture a farmer driving a large tractor across a huge field ? If you do , you will be partly correct ...
Side 89
... modern agriculture that replaces them . Other millions of small farmers have stayed on the farms but have adopted modern practices in- cluding the use of fertilizers and high - produc- ing seeds and the efficient use of small machines ...
... modern agriculture that replaces them . Other millions of small farmers have stayed on the farms but have adopted modern practices in- cluding the use of fertilizers and high - produc- ing seeds and the efficient use of small machines ...
Side 111
... Modern airliners and military aircraft can fly at extremely high altitudes , where lower air pressure and oxygen content make breath- ing difficult . Also , the rapid changes in air pressure that occur when changing altitude can cause ...
... Modern airliners and military aircraft can fly at extremely high altitudes , where lower air pressure and oxygen content make breath- ing difficult . Also , the rapid changes in air pressure that occur when changing altitude can cause ...
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