Denudation Lesson Plan.

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Presentation transcript:

Denudation Lesson Plan

What is denudation? The shaping of the earth

What shapes the land?

Denudation processes Weathering erosion mass wasting/ mass movement What are they?

What is weathering? Processes leading to disintegration and decomposition of rock in situ processes

How does the rock break up? 1. Mechanical weathering/ Physical weathering 2. Chemical weathering 3. Biotic / Biological weathering

Mechanical weathering Caused by temperature changes unloading brought about by denudation salt crystal growth

Block Disintegration With repeated expansion and contraction, the rock breaks up along joints

A Disintegrated block

Exfoliation

Rock peels off

Granular disintegration

Chemical weathering Decomposition of rock caused by rain, air (e.g. Carbon dioxide) and organic acids. Active in hot and wet areas

What Chemical Processes? Solution Hydration Hydrolysis Oxidation Carbonation How do they act on rock?

Honeycomb weathering

They are always found near the coast. Why?

Spheroidal weathering Partially weathered core-stone Totally weathered outer layer

Biotic/ Biological Weathering Physical break up of rock by plant roots or burrowing animals Chemical decay of rock facilitated by organic acid produced by plants and animals

Weathered granite in HK