Mechanical or Chemical Weathering Limestone Statue Mechanical or

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Mechanical or Chemical Weathering? Limestone Statue

Mechanical or Chemical Weathering? Limestone Statue

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Mechanical or Chemical Weathering?

Products of Weathering

Products of Weathering

Sediments • Weathered rock particles.

Sediments • Weathered rock particles.

Sediment Sizes • Arrange these particles from largest to smallest: Sand, Pebble, Clay, Boulder,

Sediment Sizes • Arrange these particles from largest to smallest: Sand, Pebble, Clay, Boulder, Cobble, Silt

Page 6 of ESRT

Page 6 of ESRT

Sediment Size (Continued) • • • Boulder: 25. 6 cm and greater Cobble: 6.

Sediment Size (Continued) • • • Boulder: 25. 6 cm and greater Cobble: 6. 4 – 25. 6 cm Pebble: 0. 2 – 6. 4 cm Sand: 0. 006 – 0. 2 cm Silt: 0. 0004 – 0. 006 cm Clay: Less than 0. 0004 cm

Soils • Two components: weathered rock and organic matter

Soils • Two components: weathered rock and organic matter

Soils (Continued) • Parent Material: The rock the soil comes from. • Residual Soil:

Soils (Continued) • Parent Material: The rock the soil comes from. • Residual Soil: Bedrock is the parent material. • Transported Soils: Moved by water, winds, or glaciers.

Residual Soil

Residual Soil

Transported Soil • Often layers of “sorting” when deposited by streams • Poorly sorted

Transported Soil • Often layers of “sorting” when deposited by streams • Poorly sorted when deposited by glaciers

Soil Profile • Side view of soil layers. • Mature soil: Four zones or

Soil Profile • Side view of soil layers. • Mature soil: Four zones or Horizons

Put the four horizons in order (Top to Bottom) • A-Horizon: Highly decomposed organic

Put the four horizons in order (Top to Bottom) • A-Horizon: Highly decomposed organic matter and small rock particles (sand or smaller), leaching of minerals to lower layers. • B-Horizon: Larger rock particle, clays and little organic matter, leached minerals deposit in this layer, giving it a reddish brown/tan color. • C-Horizon: Consists of partly weathered bedrock. • O-Horizon: Composed of organic matter, dark brown to black in color • R-Horizon: Unaltered bedrock

Soil Profile (Continued) • Not all soil horizons are always clearly present.

Soil Profile (Continued) • Not all soil horizons are always clearly present.

• • • 1) O-Horizon 2) A-Horizon 3) B-Horizon 4) C-Horizon 5) R-Horizon

• • • 1) O-Horizon 2) A-Horizon 3) B-Horizon 4) C-Horizon 5) R-Horizon

Soil Profile • O-Horizon: Organic matter, dark brown to black. • A-Horizon: Very decomposed

Soil Profile • O-Horizon: Organic matter, dark brown to black. • A-Horizon: Very decomposed organic matter and small rock particles (sand or smaller), minerals have been leached. • B-Horizon: Larger rock particles, clays and little organic matter, deposited minerals cause reddish brown/tan color. • C-Horizon: Consists of partly weathered bedrock. • R-Horizon: Bedrock.

Soils are influenced by Climate • Tropical soils: Minerals leached out by rainfall. •

Soils are influenced by Climate • Tropical soils: Minerals leached out by rainfall. • Desert soils: Mineral rich • Arctic soils: Poorly drained, permafrost • Forest soils: O-Horizon is most prominent, yearly leaf collection.

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