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Copy of Soil Horizon

The different types of soil in the layers of soil:)
by

Rachel Green

on 29 January 2013

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Transcript of Copy of Soil Horizon

So, what is soil, anyway? B Horizon O Horizon A Horizon Soil is a layer of rock and decayed plant and animal matter that is layered above bedrock. It also contains BACTERIA and NUTRIENTS that plants need! C Horizon The O Horizon is the top layer of soil made up of leaf litter and humus The uppermost, darkest zone that is rich in organic matter usually known as "Topsoil." The A Horizon is characterized by dark humus and nutrients. The lowermost zone, consisting mainly of broken-up weathered rock fragments called "regolith." This horizon has no plant roots and very little organic matter This layer of a soil profile immediately below the A horizon, containing leached materials from above such as clay and mineral deposits.This is also called the "Subsoil" and "Leaching Layer" R Horizon The R Horizon is also known as "Bedrock" or "Parent Material" and is the unweathered rock beneath the soil layers. Granite, basalt, quartzite, and indurated limestone or sandstone are examples of bedrock, The Soil Horizons air parts of soil water organic matter sand clay small mineral particles large mineral particles silt medium mineral particles http://www.montereyinstitute.org/courses/AP%20Environmental%20Science/course%20files/multimedia/lesson51/animations/4c_soil_profile.html http://courses.soil.ncsu.edu/resources/soil_classification_genesis/soil_formation/soil_transform.swf bacteria
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