Lesson 2 The Rhine

Lesson 2
Weathering
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AardrijkskundeMiddelbare schoolhavo, vwoLeerjaar 2

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Lesson 2
Weathering

Slide 1 - Diapositive

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For today
  • Homework
  • Note
  • Exercise
  • Get to work!

Slide 2 - Diapositive

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Homework
Make 1 up to 4 of lesson 1

Slide 3 - Diapositive

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Goals
  • Students know how the alps are formed.
  • Students know what weathering is.
  • Students know different types of weathering and can explain the difference.

Slide 4 - Diapositive

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Some recap from last year

Slide 5 - Diapositive

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Endogenous + exogenous forces

  • The earth's crust can change
    from two directions:
  • Endogenous = from within the
    earth
  • Exogenous = from outside the
    earth



Slide 6 - Diapositive

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Exogenous Forces:
  •  Avalanche
  •  Mudslide
  •  Crumbling of rocks (weathering)
  •  Erosion

Endogenous forces:
  •  Volcanism
  •  Earthquakes
  •  Plate tectonics
  •  Mountain formation

Slide 7 - Diapositive

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Forming of the Alps

Slide 8 - Diapositive

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Slide 9 - Vidéo

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Weathering
  • What is weathering?
  • The disintegration of hard rock under the influence of weather and the action of plants.
  • Gravity rolls, falls or slides the weathered rock down the mountain , we call this a mass movement.







Slide 10 - Diapositive

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All rock weathers, but how?
Where is the solid rock and where is the weathering material?

Slide 11 - Diapositive

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Think-share-exchange
Why do we find fossils of marine animals high up in the Alps?
  1. Think for yourself and write down an answer.
  2. Share with one other person what your and their answer is.
  3. Exchange within a group of four your answers
timer
3:00

Slide 12 - Diapositive

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Get to work!
  1. Read lesson 2 up to 'There are two types of weathering'.
  2. Mark all the important sentences
  3. Make exercises 1, 2a, 2b, 3a & 3d

Slide 13 - Diapositive

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Goals
  • Students know how the alps are formed.
  • Students know what weathering is.
  • Students know different types of weathering and can explain the difference.

Slide 14 - Diapositive

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Weathering
  • There are two kinds of weathering.
  1. Mechanical weathering
  2. Chemical weathering

Slide 15 - Diapositive

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Slide 16 - Vidéo

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Mechanical weathering
  • Mechanical means it happens with some sort of movement.
  1. Freezing of water (ice expands) -->  frost weathering
  2. Growing plant roots --> biological weathering
  3. Shrinking of rocks during cold and expanding by heat from the sun.

  4. --> Frost weathering


Slide 17 - Diapositive

Rainwater runs into the crevices
Rainwater in crevices freezes

How do the rocks weather overhere?

Slide 18 - Diapositive

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Mechanical weathering
  • Roots of trees grow in the crevices
  • The roots push the rock apart
  • --> biological weathering

Slide 19 - Diapositive

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How do the rocks weather overhere?

Slide 20 - Diapositive

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Weathering
  • --> Chemical weathering
  • Chemical weathering: changes the composition of the rock.
  • Moisture + oxygen react with rock.
  • Iron + water + air = rust






Slide 21 - Diapositive

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What kind of weathering do you see in this photo?

Slide 22 - Diapositive

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Weathering
  • How do you recognize from the photo
    that this sculpture has been affected
    by chemical weathering?
  • Small parts of the image are dissolved.
    You can tell by the small holes.
  • Colour differences.



Slide 23 - Diapositive

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Chemical weathering
  • An example of chemical
    weathering can be found
    in limestone.
  • Karst name of all
    landscape forms that are
    associated with the
    dissolution of limestone
    in water.

Slide 24 - Diapositive

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Get to work!
  1. Read lesson 2 completely.
  2. Mark all the important sentences
  3. Make exercises 1, 2a, 2b & 3a, 3c & 3d, 4a, 5 & 6a.

Slide 25 - Diapositive

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Goals
  • Students know how the alps are formed.
  • Students know what weathering is.
  • Students know different types of weathering and can explain the difference.

Slide 26 - Diapositive

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