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Day 8 weathering unconformity
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Day 8 weathering unconformity

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  • http://www.classzone.com/books/earth_science/terc/content/visualizations/es2902/es2902page01.cfm?chapter_no=visualization

Transcript

  • 1. Weathering - 10/17/11Bell Ringer1. Fossils of warm-weather plants were found on an island in the Artic Ocean. What can best be concluded from this discovery?2. Convection currents in Earth’s mantle are believed to be responsible for?
  • 2. DemonstrationWhen I tell you, place the starburst in your mouth, but DO NOT CHEW!I will let you know when you can chew. Chemicals in your saliva break down the candy bar. When you chew, your teeth physically break up the candy into smaller pieces.
  • 3. KEY WORDS• Weathering –Chemical weathering –Mechanical weathering• Erosion• Unconformities
  • 4. Why do we find small rocks?How do rocks get so small??How do mountains get worn down to become pebbles?
  • 5. • Weathering is how rocks are broken, worn down, changed in color or composition by the action of water, air, plants and animals.• Weathering happens to rocks in place-- there is no movement of the rock involved.
  • 6. There are TWO kinds of weatheringMechanical Chemical
  • 7. Types of Weathering• Mechanical Weathering- does NOT change the substance, it just makes it smaller – Ex: A rock breaks in half• Chemical Weathering- CHEMICALLY CHANGES the substance, usually indicated by a color change. – Ex: A limestone statue gradually becomes grey and black over time and worn down from acid rain
  • 8. Vocabulary• Weathering: Rock is broken down• Chemical Weathering: Chemicals break down rock. – Ex: Acid Rain• Mechanical Weathering: Big rocks are broken into small rocks. – Ex: Ice wedging• Unconformity: A gap in the rock record
  • 9. Unconformities
  • 10. Gallery Walk• Answer the following at each: 1. Describe the picture. 2. Is this an example of mechanical or chemical weathering? 3. How do you know? Stay at each “painting” until time is called.
  • 11. Gallery Walk Expectations• You WILL work with your tables- NO ONE ELSE• Noise level is at a “talking side by side” level.• You will remain at your “painting” until the music stops – you will not move ahead.• EACH column of gallery walk feedback form is filled in WHILE you are at that station.• You will keep hands, feet, objects to YOURSELF.• Warning: If YOU MAKE THE CHOICE to not meet these expectations, YOU have MADE THE CHOICE to complete work alone, silently in your seat. Make the RIGHT CHOICE 
  • 12. What did you discover on your Gallery Walk?
  • 13. Discovery Streaming Clip• http://www.youtube.com/watch?v=lvKkPF oRiaw (breaker and woosh)
  • 14. Write Time! (In your notebook, write at least 3 complete sentences)How was the candy demonstration similar to chemical and mechanical weathering? Which step was CHEMICAL? Which step was MECHANICAL?
  • 15. Discuss• How does weathering contribute to unconformities?• How do unconformities change scientists’ understanding of Earth’s history?
  • 16. Venn Diagram Exit TicketCreate a Venn Diagram Comparing and Contrasting Chemical and Mechanical Weathering.You should provide at least 2 facts for each section.