ReviewMechanical WeatheringChemical WeatheringErosionUniformitarianismSoil3 HorizonsDecomposers

• The soil in the dirt beneath our feet is made up of different layers

• 3 main layers of Soil– Horizon A – also known as topsoil– Horizon B – called subsoil– Horizon C – made of rock but not solid

• Bedrock – solid rock

• The soil is formed from bare bedrock and, as weathering, erosion and deposition occur, new types of soil are formed.

• What types of weathering could make new soil like this?

• Is broken down rock the only place that new soil could come from?

• New Soil being formed (succession examples)

• (soil interactive website)

Animals that help to transport soil from

one layer to the next

tremors

Conservation

Contour Plowing

Contour Plowing

Crop Rotation

http://www.thriftyfun.com/tf70215663.tip.html

Nitrogen Cycle

Crop Rotation