Weathering And Erosion Weathering Erosion Erosion and weathering
- Slides: 32
Weathering And Erosion
Weathering & Erosion: Ø Erosion and weathering are major forces that shape Earth’s surface. Ø For example, the Grand Canyon was formed through erosion by the Colorado River running through it!
What is weathering? Weathering: The breaking down of rocks into smaller pieces. 1. Mechanical /Physical 2. Chemical Hulk Rock Smash!
So what is erosion? Erosion: The movement of weathered rock by wind, water, glaciers & gravity
Types of Weathering: Mechanical/Physical: Rock is physically broken into smaller pieces (larger pieces become smaller pieces of the same rock) Chemical: Rock is chemically changed (like rusting or dissolving away)
5 Agents of Mechanical Weathering: 1. 2. 3. 4. 5. Release of Pressure Freezing & Thawing Animal Actions Plant Growth Abrasion
Release of Pressure Ø As the surface of a rock is eroded, the rock begins to release pressure Ø Causes top layers of the rock to crack and flake off
Release of pressure: rock cracks like an egg shell
Freezing & Thawing When water in the cracks of rocks freezes it expands causing the crack to enlarge or get bigger. The ice melts & refreezes over & over, breaking the rock apart.
Result of Freezing & Thawing
Animal Actions ØAnimals dig (burrow) through the ground to make their homes. This loosens the soil & breaks apart rocks.
Plant Root Growth Plants roots can grow into cracks in the rock, slowly breaking them apart.
Abrasion l l Sand other rock particles in wind, water or ice can wear away exposed rock surfaces. Like sandblasting or sandpaper on wood
Chemical Weathering The process that breaks down the surface of rock by chemical changes.
1. 2. 3. 4. 5. 5 Agents of Chemical Weathering Water Oxygen Carbon Dioxide Living Organisms Acid Rain
Water ØWater dissolves rock ØWater is the most important cause of chemical weathering
Oxygen Ø Oxygen + Water + Iron = Rust through the Chemical reaction called Oxidation Ø Rock will become crumbly, soft, and appear reddish-brown in color
Rusted rock on hillside
Carbon Dioxide CO 2 + rainwater = Carbonic Acid weathers softer rock like limestone & marble as it seeps into spaces in rock. Ex: sinkholes, caves
Living Organisms ØThe roots of plants make a weak acid that slowly dissolves rocks around the plant.
Lichens grow on rock
Acid Rain ØAcid rain causes rocks to weather very rapidly.
- Rill erosion
- Enchanted rock weathering
- Boatero
- Waves dropping sand on the beach is an example of what
- Bill nye weathering and erosion
- Weathering video
- Weathering and erosion difference youtube video
- Questions on weathering and erosion
- Cross timbers weathering erosion and deposition
- Erosion in cross timbers
- Weathering and erosion agents
- Physical erosion
- Weathering erosion and deposition
- Weathering and erosion
- V shaped valley formed by
- Chapter 14 weathering and erosion review answers
- What happens when weathering and erosion work together?
- Weathering webquest
- Chapter 7 weathering erosion and soil
- Weathering and soil erosion
- Distinguish between weathering and erosion
- Weathering and soil erosion
- Breaking down of rocks
- Types of soil erosion
- Types of weathering
- Weathering and erosion
- What is weathering and erosion
- Deposition earth science
- Weathering and erosion
- Examples of erosion in texas
- Erosion and weathering
- Types of weathering
- Swabt