2.2 Rock changes

Rock changes
Chapter 2 Paragraph 2
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AardrijkskundeMiddelbare schoolhavo, vwoLeerjaar 2

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Rock changes
Chapter 2 Paragraph 2

Slide 1 - Diapositive

Mountains can look different
How?

Slide 2 - Diapositive

Mountain ranges
Young
- High
- Steep
- Pointed mountain peaks
- Deep valleys

Slide 3 - Diapositive

Mountain ranges
Old
- Lower
- Gentle slopes
- Rounded tops
- Wider valleys

Slide 4 - Diapositive

Weathering
Rock crumbling under the influence

1. Mechanical weathering
2. Chemical weathering
3. Biological weathering

Slide 5 - Diapositive

This is because of exogenic forces
-> the hard rocks of the mountains slowly wear away.
-> boulders crumble into gravel.
-> gravel is crushed into sand and clay.

Weathering material (the debris created after weathering) remains on site.

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Under the influence of gravity, this weathering material can roll or slide downwards = mass movement.

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Mechanical weathering
1. Due to the expansion and contraction of water with temperature changes -> Frost weathering
2. Due to the expansion and contraction of the stone itself due to large temperature changes

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3. Biological weathering

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Chemical weathering
The disintegration/dissolution of rock due to the fact that liquid and oxygen changes the composition of the rock.

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Look at source 8

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Slide 15 - Vidéo