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Download Soil and Soil Formation
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Soil How much soil is there? How is soil formed? How is soil formed? How is soil formed? From organic matter (alive or was alive) How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) How is soil formed? From organic matter (alive or was alive) Weathering (rocks and minerals breaking up) From inorganic matter (never alive) How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers Physical Weathering How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers Physical Weathering Freezing / thawing roots animals walking How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers Physical Weathering Chemical Weathering Freezing / thawing roots animals walking How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers Physical Weathering Chemical Weathering Freezing / thawing roots animals walking Dissolution (dissolving) How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers Physical Weathering Chemical Weathering Freezing / thawing roots animals walking Dissolution (dissolving) Oxidation (rusting) How is soil formed? From organic matter (alive or was alive) From inorganic matter (never alive) Weathering (rocks and minerals breaking up) Deposition (deposited) by erosion or glaciers Physical Weathering Chemical Weathering Freezing / thawing roots Dissolution (dissolving) Oxidation (rusting) animals walking Acid rain Does soil come in different sizes? Soil sizes: Soil sizes: Sand: 0.05 to 2.0 mm diameter Soil sizes: Sand: 0.05 to 2.0 mm diameter Silt: 0.002 to 0.05 mm diameter Soil sizes: Sand: 0.05 to 2.0 mm diameter Silt: 0.002 to 0.05 mm diameter Clay: < 0.002 mm diameter What are the layers of soil on top of the lithosphere? Layers of soil (horizons) Layers of soil (horizons) “O” horizon: top layer of litter (leaves, decaying plants, etc.) Layers of soil (horizons) “O” horizon: top layer of litter (leaves, decaying plants, etc.) “A” horizon: topsoil that contains humus and minerals. Layers of soil (horizons) “O” horizon: top layer of litter (leaves, decaying plants, etc.) “A” horizon: topsoil that contains humus and minerals. “B” horizon: subsoil such as clay, loam, or silt. Layers of soil (horizons) “O” horizon: top layer of litter (leaves, decaying plants, etc.) “A” horizon: topsoil that contains humus and minerals. “B” horizon: subsoil such as clay, loam, or silt. “C” horizon: weathered parent rock and glacial deposits. Layers of soil (horizons) “O” horizon: top layer of litter (leaves, decaying plants, etc.) “A” horizon: topsoil that contains humus and minerals. “B” horizon: subsoil such as clay, loam, or silt. “C” horizon: weathered parent rock and glacial deposits. “R” horizon: Un-weathered parent rocks.
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