2 - Weathering, erosion and depostion

• Aardrijkskunde
• Middelbare school
• havo, vwo
• Leerjaar 2

LANDSCAPE

TTO 2

Mister de Graaf

Boss of Geography

What is this topic about?

Two to three instructional lessons from the boss

Two to three work lessons

Presentations in groups of 2 or 3 students about one of the rivers given

You'll be taking the class on a cruise along your river

Upper-, middle- and lower course

A river flows from high to low

• Upper course
• Middle course
  
• Lower course

What do these rocks have in common?

Weathering

"Weathering: The crumbling of rocks under the influence of the weather and plants.." - De Graaf

This can happen in different ways...

Weathering (1/4)

Frost wedging: Weathering due to the freezing of water

Weathering (2/4)

Thermal stress: weathering due to the heating and cooling of rocks

Verwering (3/4)

Biological: Weathering by roots of plants or trees

Verwering (4/4)

Chemical: Weathering by dissolving water with acids from plant remains

Weathering material

"Weathering material: The crumbled rock due to weathering." - De Graaf

This can then be carried by the wind, by a glacier, or by a river!

Erosion

"The wearing away of rock by water, wind or ice loaded with weathering material." - De Graaf

How is this landscape formed?

Water or wind erosion?

Can this section of the river carry

a lot or a little weathering material?

Is there a lot or little erosion?

What about this section of the river?

Deposition / sedimentation

"Deposition: Laying down weathering material."

- De Graaf

Where do we find: weathering / erosion / deposition mostly?

What's happening over here though?