Monday, February 25, 2019 Objective: YWBAT describe the three soil horizons and how they form. Drill: Identify and describe the three soil horizons. Homework Study WOW

Answer Horizon A Horizon B Horizon C The top layer, Consists of topsoil and Contains more humus than any other layer. Horizon B Subsoil Where clays and dissolved substances from Horizon A collect, Contains less humus than Horizon A Horizon C Consists of partially weathered bedrock which is usually the parent rock of the above soil

Did you know…? In some desert areas, a special soil called crytogamic soil is actually alive! The soil is composed of different species of mosses, lichens, fungi, and algae. It is dark brown and crusty. It absorbs water like a sponge and provides a unique habits for desert seeds to germinate.

Geoblox ‘Soil Profiles’ Conclusion Today’s Activities Drill Geoblox ‘Soil Profiles’ Conclusion

List four factors that affect the rate at which soil horizons form. Closure List four factors that affect the rate at which soil horizons form.

Closure Answer Type of bedrock Climate Local topography Type of organisms present