Download
today s agenda jan 24 th n.
Skip this Video
Loading SlideShow in 5 Seconds..
Today’s Agenda…Jan. 24 th PowerPoint Presentation
Download Presentation
Today’s Agenda…Jan. 24 th

Today’s Agenda…Jan. 24 th

148 Vues Download Presentation
Télécharger la présentation

Today’s Agenda…Jan. 24 th

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Today’s Agenda…Jan. 24th • Bellringer: How do volcanoes form? • Share Homework • Weathering vs. Erosion • Notes on Weathering • BrainPop on Weathering • Homework

  2. BEFORE: Weathering or Erosion? • An old tombstone that is hard to read • A mountain after a landslide • Sand dunes • Rocks broken into tiny pieces • A crack in a sidewalk • A ditch where water has once flowed

  3. Weathering Science 6 Study Pack #6

  4. Weathering • A process that breaks down rocks • Mechanical • Chemical

  5. Mechanical Weathering • Breaks rocks into smaller pieces WITHOUT changing them chemically • Smaller pieces are identical to the original rock • Two causes are: • Ice (or Frost) Wedging • Plants and Animals

  6. Ice Wedging • Water from rain or snow seeps into cracks in rocks • The water freezes and expands making the cracks open further until the rock breaks

  7. Plants and Animals • Roots grow into cracks in rocks where water collects and force the rock apart • Some animals burrow through rocks and break them apart

  8. Chemical Weathering • Occurs when the chemical composition of a rock changes • Causes are • Natural acids • Oxygen

  9. Natural Acids • Carbonic acid (water and carbon dioxide) can dissolve certain rocks • Some plants produce acids that can affect rocks

  10. Oxygen • When oxygen reacts with the iron in rocks it turns them orange or red

  11. Assignment • Frayer Model for Vocabulary • Weathering • Definition – In your own words • Characteristics – You may want to include types here • Examples • Nonexamples