2.2 Rock changes

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• Leerjaar 2

Rock changes

Chapter 2 Paragraph 2

Mountains can look different

How?

Mountain ranges

Young
- High

- Steep

- Pointed mountain peaks

- Deep valleys

Mountain ranges

Old
- Lower

- Gentle slopes

- Rounded tops

- Wider valleys

Weathering

Rock crumbling under the influence

1. Mechanical weathering

2. Chemical weathering

3. Biological weathering

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.

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

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

3. Biological weathering

Chemical weathering

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

Look at source 8