Horizon Horizon is a side profile of the layers of soil Soil is usually divided into 3 main layers but will also include the layers above and below for a total of 5 layers Soil Horizons Diagram ID: 544232
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Slide1
Soil HorizonSlide2
Horizon
Horizon is a side profile of the layers of soil
Soil is usually divided into 3 main layers, but will also include the layers above and below for a total of 5 layers. Slide3
Soil Horizons Diagram
O Horizon:
Litter
N
A Horizon: Topsoil
B Horizon: Subsoil
C Horizon:
Parent Material
R Horizon: Bedrock
Copy this into your notesSlide4
O Horizon: Litter
Not really a layer of soil
It’s on top of the first layer of soil
Contains grass, plants, and animalsSlide5
A Horizon: Topsoil
1
st
layer of soil
Darkest layer of soil (dark brown or black)
Contains humus, plant roots, small animals, water, and nutrients for plant growth
The darker the soil, the more nutrients it containsSlide6
B Horizon: Subsoil
2
nd
layer of soil
Lighter in color (reddish brown)
Fewer nutrients and waterLimited plant growthSlide7
C Horizon: Parent Material
3
rd
layer of soil
Lightest in color (gray)
No nutrients, animals, or plant growthContains weathered rock and sedimentSlide8
R Horizon: Bedrock
Below the last layer of soil
Solid Rock
Has not been weathered or broken down yet
No soil in this layer