Soil formation worksheet

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Use the worksheet above to answer the following questions. _____ 1. Which layer in the diagram below contains the most organic material? 1. A 2. B 3. C 4. the bedrock _____ 2. How is soil created from rock? 1. physical weathering without chemical weathering 2. chemical weathering without physical weathering 3. erosion 4. both chemical and physical weathering _____ 3. Approximately how many years does one centimeter of topsoil take to form? 1. 100 – 400 years 3. 1000 – 4000 years 2. 10 – 40 years 4. 10,000 – 40,000 years _____ 4. Which of the following is found in the greatest % in soil? 1. Mineral matter 2. Organic matter 3. Water 4. Air _____ 5. Which layer of a soil profile forms first from the bedrock? 1. A horizon 2. B horizon 3. C horizon 4. Humus _____6. The cross section below shows layers of soil Which 2 processes produce the layer of dark brown to black soil? 1. Erosion and uplift 3. Compaction and cementation 2. Melting and solidification of lava 4. Weathering and biological activity

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