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Chapter 10 Weathering, Soil, Erosion. Weathering Mechanical Weathering (Physical) Pressure Release,...

Date post: 02-Jan-2016
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Chapter 10 Weathering, Soil, Erosion
Transcript

Chapter 10

Weathering, Soil, Erosion

Weathering

• Mechanical Weathering (Physical) Pressure Release, Frost Wedging, Abrasion, Organic activity• Chemical Weathering (removing or exchange

of ions from the minerals) Dissolution, Hydrolysis, Oxidation,

Erosion Transport Deposition

Pressure Release

Frost Wedging

Abrasion

Organic Activity

DissolutionOccurs when water removes ions from the mineral.Example : Halite

HydrolysisIs the exchange of H or OH from an ion in a mineral.

Oxidation

EXFOLIATION• Chemical and Mechanical act together• Exfoliation large plates or shells split away

like onion layers

Soil

• A thin layer of loose fragments , clay, sand overlies bedrock is called REGOLITH.

• SOIL is defined as the upper layers of regolith that support plants.

• Soil is a mixture of mineral grains, organic material

Soil HorizonsLeaves, stems, and Flowers in the soil surface Litter decomposed Humus

Soil Forming Factors

• Parent Rock • Climate• Rates of plant growth and Decay• Slope Aspect and Steepness• Time • Soil Transport

Erosion

Landslides• Mass Wasting Download movement of earth

material caused by Gravity

Angle of Repose

Types of Landslide

Creep 1cm per year

Fall


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