Introtoweathering

The Wonderful World of Rock Weathering Mdm Masayu Mahmud Department of Humanities Innova Junior College, Singapore

What geologic processes causes these rocks to weather?

Dairy Farm Estate Granite Outcrop, Singapore

Denudation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Erosion ,[object Object],[object Object]

Why Do Rocks Weather? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Types of Weathering ,[object Object],[object Object],[object Object]

Mechanical Weathering ( MW) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Chemical Weathering (CW) ,[object Object],[object Object],[object Object],[object Object]

Biological Weathering (BW) ,[object Object],[object Object]

Products of Weathering Type of weathering Product of weathering and erosion Type of sediment ultimately deposited Mechanical weathering Fragments containing the same minerals as the original rock (e.g. grains of quartz from a granite) Clastic sediments and sedimentary rocks (e.g. sand and sandstone) Chemical weathering New solid mineral particles formed by chemical reactions during weathering (e.g. Clay minerals) Material dissolved in water (e.g. Calcium ions) Chemical and biological sediments (e.g. limestone and rock salt)

A Point to Note ,[object Object],[object Object],[object Object]

Factors Influencing Rate of Weathering ,[object Object],[object Object],[object Object],[object Object],[object Object]

1. Climatic Factor ,[object Object],[object Object],[object Object],[object Object],[object Object]

2. Rock Types ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Hard Rock Not? ,[object Object],[object Object],[object Object],[object Object]

3. Relief, Topography and Slope ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

4. Effect of Vegetation ,[object Object],[object Object],[object Object]

5. Impact of human activities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results of Weathering Processes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Exfoliated Rocks and Spheroidal Boulders

Lateritic Soil A Laterite soil cross section in Brazil. The deep red color is due to Fe 3+ hydroxide minerals in the soil.

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