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By DK Publishing

This fascinating new sequence makes use of colourful photos, easy textual content labels, and enjoyable "I undercover agent" video games to introduce curious preschoolers to the area.

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Animals (Let's Look)

This intriguing new sequence makes use of colourful pictures, basic textual content labels, and enjoyable "I secret agent" video games to introduce curious preschoolers to the area.

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SOIL BUILDING MAY FOLLOW WEATHERING SUCH THAT NO WEATHERED MATERIAL THAT IS NOT INCLUDED IN THE SOLUM IS FOUND BETWEEN BAND D. ) HORIZONS OF MAXIMUM BIOLOGICAL ACTIVITY.! OF ELUVIATION (REMOVAL OF MATE"IALS DISSOLVED OR SUSPENDED IN WATER lOR BOTH. ORGANIC DEBRIS LODGED ON THE SOIL, USUALLY ABSENT ON SOILS DEVELOPED FROM GRASSES. :S ~ 28 Chapter 4 -- Aoo Ao AI Az Ao 8Aoo All All As As BI BZI BI B22 Bs Bs Cca C Dr A AI Aa -- 8, BI' - Blu Bla C - - Ccs B CCIl C C C C AI AI 0 AI I, AB. Ba 2 B8 0 E -F BSII!

The chain silicates occur in more specialized situations, but do occur in some desert soils. A classification of the principal clay minerals is given in Table 6. Identification of the clay minerals in soils of the earth's outer crust has been made possible by x-ray diffraction techniques. Prior to World War II, although the principals of x-ray diffraction were well known and had been investigated many years earlier, x-ray diffraction units had not been perfected or produced commercially and were not available to research institutions or to universities.

Feldspar Augite (pyroxene) \ I Alkali feldspar (albite) Hornblende \ / Orthoclase (potash feldspar) Biotite I Microcline -------! Muscovite Quartz High stability Fig. 9. A weathering stability series (after Goldich, 1938). 033 2,685 189,000 21,536 479,900 5,034 52 47 114 228 2,523 90 1,683 1,837 386 173 1,025 478 All figures in I b / acre. minerals are the climatic and topographic conditions under which a rock forms soil. The grain-size analyses of soils indicate in a general way the amount of residual rock fragments (large) and mineral grains (small) in weathering products (Section 7-4).

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