• Weathering is the breaking down of rock, stone or mineral. 
• Mechanical weathering includes heat and frost weathering. 
• Chemical weathering is caused by acidic substances that have dissolved in water.
• Mass slides can occur on mountain slopes. They are caused by weathering, and can take the form of landslides, mudslides, rockslides, and avalanches. 
• Key words: weathering, frost weathering, heat weathering, chemical weathering, karst, stalactite, fragmented rock, landslide, mudslide, rockslide, avalanche.