Today’s Agenda…Jan. 17th Bellringer: What is weathering? Draw a picture of it!  Review Mechanical Weathering Finish Notes on Weathering BrainPop on Weathering.

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Presentation transcript:

Today’s Agenda…Jan. 17th Bellringer: What is weathering? Draw a picture of it!  Review Mechanical Weathering Finish Notes on Weathering BrainPop on Weathering Exit Slip

Weathering Science 6 Study Pack #8

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

Results from last week… 1st Period 3rd Period 7th Period

Weathering

Weathering

Weathering

Weathering

Weathering A process that breaks down rocks Mechanical Chemical

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

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

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

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

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

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