Weathering

Example of mechanical weathering

Freeze-thaw action

Where does mechanical weathering occur?

High mountainous areas, lots of precipitation.

Regularly falls below freezing points

How does mechanical weathering occur?

1. During day, water seeps into crack of the rock

3. At night - 0°C - water freezes + expands by 90% - pressure.

4. Continues, widening rock + weakens. Pieces break off.

Example of where mechanical weathering occurs?

Croagh Patrick - Co Mayo.

Example of chemical weathering

Carbonation

Where does chemical weathering take place?

On limestone

How does chemical weathering occur?

1. CO2 in atmos mixes with H2O to form a weak carbonic acid.

2. The weak carbonic acid reacts with calcium carbonate in limestone -> dissolve.

Example of where chemical weathering takes place?

The Burren, Co Clare.