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Soil

Soil Notes (Draper)

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Soil: The Base of Life Major Layers Found in Soil a.Soil Horizons Series of zones with distinct texture and composition. Soil Profile is a cross-sectional view Most soils have at least 3 horizons b. Horizon O (Top Layer) 1. Consists of freshly fallen and partially decomposed leaves, twigs etc? 2. Appears Brown or Black, Humus ? Sticky, brown residue of partially decomposed organic material. c. Horizon A (Topsoil Layer) 1. Partially decomposed matter ?humus? and topsoil. 2. Most roots and organic matter are found in Horizon A and O 3. Horizon A and O team with bacteria, fungi, earthworms, insects ? create food web. 4. Color of soil tells a lot ? brown and black = nitrogen rich - Gray, Yellow, Red low inorganic matter. d. Horizon B (Subsoil)

Soil-Earth's Living Skin

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P ro s p e c tu s f o r a k e y t h e m e o f t h e I n te rn a ti o n a l Y e a r o f P la n e t E a rt h E a r t h s c i e n c e s f o r s o c i e t y www.yearofplanetearth.org Soil - Earth?s living skin What is this brochure for? This brochure is a prospectus for one of the main scientific themes of the International Year of Planet Earth. It describes, in accessible terms, why this particular theme has been chosen - why the research that the Year hopes to support under this theme is of such vital importance to our understanding of the Earth System, and to society at large. The prospectus was written by a panel of world experts assembled by the Science Programme Committee of the Year. To find out more?

Political Organization in Early China

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Political Organization in Early China A. Early Agricultural Society and the Xia Dynasty 1) The Yellow River a. Water source at high plateau of Tibet b. Loess soil carried by the river’s water, hence “yellow” c. “China’s Sorrow”--extensive flooding d. Loess provided rich soil, soft and easy to work 2) Neolithic societies after 5000 B.C.E. a. Yangshao society, 5000-3000 B.C.E. b. Excavations at Banpo village: fine pottery, bone tools 3) The Xia Dynasty a. Archeological discovery of the Xia is still in its early stages b. Established about 2200 B.C.E. c. Legendary King Yu, the dynasty founder, a hero of flood control
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