Weathering Types of Weathering n n Mechanical physical
- Slides: 27
Weathering
Types of Weathering n n Mechanical (physical) weathering Chemical weathering
Mechanical Weathering 6 causes: n Frost Wedging (Temperature) n Abrasion n Exfoliation n Trees n Wind n Pressure
frost wedging can cause a landslide
frost wedging causes damage to roads.
Where does Frost Wedging occur? n n Frost wedging can only occur in a region that has temperatures that go above and below 32 degrees F. Frost wedging not likely in Florida
Exfoliation at Stone Mountain in Georgia
Exfoliation in the Sierra Nevada
Exfoliation in Yosemite National Park
Abrasion n n Breaking and grinding away of solid rock by collisions with moving particles. Abrasion takes place due to fast moving streams, waves and wind.
Abrasion n results are smooth, round rocks.
Trees n Tree roots can break up rocks.
Wind causes interesting shapes.
Pressure Bedrock at great depths is under pressure from the overlying rock. When the overlying rock layers are removed, the bedrock can expand. 15
Chemical Weathering
Chemical Weathering n 4 Causes: n n Water Oxygen Carbon dioxide Acid precipitation 17
Water / Hydrolysis n Hydrolysis is the process where water dissolves minerals.
Oxygen / Oxidation n n 21% of the atmosphere is Oxygen. Which readily combines with Iron to create new minerals. 19
Carbon dioxide n n n Is released into the atmosphere by living organisms. When it combines with water it forms Carbonic acid. H 2 O + CO 2= H 2 CO 3
Sinkholes form due to Carbonic acid…
…and so do Caves. 22
Acid Precipitation n n Caused mainly by the oxidation of Sulfur dioxide and Nitrogen oxides. which are released due to human activities. Sulfur dioxide forms from the burning of fossil fuels. Nitrogen oxides are emitted from motor vehicle exhausts.
n n These gases combine with Oxygen and Water in the atmosphere to form Sulfuric acid and Nitric acid. Which damage the shine and texture of stone monuments. 24
Other formations from chemical weathering Karst topography is caused by dissolution n which leads to the formation of an underground system. n
Karst Topography
The Climate n Chemical weathering occurs most often in climates with warm temperatures and high rainfall. n Physical weathering occurs most often in climates with cool temperatures and low rainfall.
- Introduction to weathering
- Physical weathering and chemical weathering venn diagram
- Kinds of weathering
- Types of weathering
- What is weathering
- What are the three types of weathering
- Weathering erosion
- Mechanical and chemical weathering venn diagram
- Identify three agents of mechanical weathering
- Whats chemical weathering
- Mechanical and chemical weathering venn diagram
- Ice weathering
- The scoop on soil
- Mechanical weathering defintion
- Compare and contrast mechanical and chemical weathering
- Whats the definition of chemical weathering
- Mechanical weathering
- Type of weathering
- Mechanical weathering is more rapid in warm wet climates
- Venn diagram mechanical and chemical digestion
- Causes of weathering
- Compare and contrast mechanical and chemical weathering
- Mechanical and chemical weathering
- Venn diagram of mechanical and chemical weathering
- Eluviation and illuviation
- Venn diagram of mechanical and chemical weathering
- What type of rock
- Soil mechanics