Types of Weathering

• Chemical• Mechanical

Agents of Weathering

• Rainwater • Oxygen • Carbon dioxide • Plant decay acids• These are all examples of

chemical erosion. They are called agents

Soil Horizons

• There are three horizons (A,B,C) in soils.

A Horizon

• Topsoil• Dark• Organic material

B Horizon

• Subsoil• contains clay• soluble minerals

C Horizon

• slightly weathered parent material

• rock fragments.

Major soil types

• There are two major soil types.• The two types are Pedocals and

Pedalfers.

Agents of erosion

• Water-beaches and rivers

• Ice-glaciers• Gravity-

landslides• Wind-sand dune

Question 1

• Which horizon is made up of slightly weathered parent material and rock fragments.

A. C HorizonB. A HorizonC. B Horizon

Right

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Wrong

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Question 2

• Which is NOT an agent of weathering?

A. RainwaterB. SoilC. Plant decay

Right

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Wrong

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List two types and four Agents of Weathering

• Two types:A. ChemicalB. Mechanical• Four AgentsA. RainwaterB. OxygenC. Carbon DioxideD. Plant Decay Acids

List and Describe each soil horizon, and how each

develops.A. A Horizon-Topsoil, Dark,

Organic materialB. B Horizon-Subsoil, contains

clay, soluble mineralsC. C Horizon-Slightly Weathered

parent material, rock fragments

List four agents of erosion, and describe the landforms associated

with each

A. Water-Beaches and RiversB. Ice-GlaciersC. Gravity-LandslidesD. Wind-Sand Dune