Soil Formation and Earth’s Structure
Presentation
•
Science
•
9th - 10th Grade
•
Medium
Standards-aligned
Hector Mendoza-Arias
Used 150+ times
FREE Resource
12 Slides • 8 Questions
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Soil Formation and Earth’s Structure
Mr. Mendoza
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Soil Formation
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What is the first step in soil formation?
The weathering of rocks
Mosses and lichens are called pioneer organisms because they are the first organisms to grow on rocks
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What is the second step in soil formation?
the addition of humus (decaying organic matter)
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Soil Profile- Draw this!(SS)
A soil profile is a cross section of soil.
There are three major soil horizons – A, B, and C.
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Horizon A
top & darkest layer (high concentration of organic matter - humus)
Top soil
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Horizon B
subsoil enriched with clay minerals leached from the topsoil.
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Horizon C
bottom layer (weathered rock)
Parent Rock
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Factors Affecting Soil Profiles
Topography (slope) of the land – Soils on slopes tend to be thinner soils in flat areas like valleys or plains are thicker
Age – older soils are thicker because they have had more time to develop.
Climate
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Distribution of Soil Types
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Soil Textures
Particles of soil are classified by size.
The particles of soil are clay, silt, & sand.
What determines a soil’s texture?
The relative proportions of these particles.
The texture of a soil affects its capacity to absorb and retain water & support plant growth.
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Soil Texture Triangle
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Multiple Choice
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Multiple Choice
Soil Formation and Earth’s Structure
Mr. Mendoza
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