Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 10 · column 4 of 6 · from the scan, no model involved
able for crop production. In our arctic regions there are vast areas of land that are either perpetually fozen or thaw for such a short period that they are not suitable for any cultivation. We also have swamp areas, jungles, and dester wastes to further reduce thsi remaining one-third. In fact, with these vast areas unsuitable for cultivation, we actually have less than one-sixth of the earth's surface suitr able for crop production.
The world’s entire prodution of food and fiber must come from a relatively thin layer of topsoil covering less than one-sixth of the earth’s surface or less than 33 million square miles. This thin layer of topsoil covers less than one-half of the land at an average plow depth. This topsoil is. made up of weathered rocks, minerals, and decaying organic matter. It supplies support for vegetation and raw
74.1%