Ch5.1 Weathering

• Aardrijkskunde
• Middelbare school
• havo
• Leerjaar 2

Welcome

Learning goals

Explanation

Working

Learning goals

− You know which forms of weathering there are.

− You understand how ice, plant roots and changes in temperature cause weathering.

− You know the types of weathered material are and how they differ in size.

− You understand how the transport of weathered material can cause erosion.

Weathering and erosion

We can think of Weathering as prepping the rock materials to be moved and erosion as when the rocks actually gets moved

Mechanical weathering

There are 2 types of weathering

Chemical and mechanical

When rocks breaks down into smaller fragments without being altered by chemicals it’s called mechanical weathering

Frost wedging

Rainwater fills open cracks

Water freezes at night

When water freezes it expands by 9 %

The ice pushes the rock from the inside and the rock crumbles

What is the difference between weathering and erosion?

Where can you find Frost weathering

1. Poles
2. High Mountains
3. Desert

Biological weathering

• The roots from a tree grow into the cracks of a rock
  
• The roots expand when the tree grows bigger, breaking the rock apart.
  

Temperature fluctuations

Weathering by temperature flactuations finds place in the following location

1. Poles
2. Tropical areas
3. Desert
4. underwater

Weathering by hot daylight and cold nights

and freezing en defrosting of water. 

Weathering by acids and chemical processes.

Weathering by plants.

Mechanical weathering

Chemical weathering

Self Study

Read	5.1
Make	Finish 5.1
How	alone
Time	10
Done?	Make Piff list/summary
Result	Check together
atlas
skip

Tijdens deze fase van de les controleer je of leerlingen jouw instructie hebben begrepen d.m.v. een begeleide oefening.

Erosion: The grinding action of water, ice or wind with weatherd material

Erosion

Weathering

Lower reaches 

Higher reaches

Middle reaches

Mostly weathering

A lot of erosion

Sediments are dropped 

Self Study

Read	5.1
Make	5.1
How	alone
Time	10
Done?	Make Piff list
Result	Check together
atlas
skip

Tijdens deze fase van de les controleer je of leerlingen jouw instructie hebben begrepen d.m.v. een begeleide oefening.

checking the homework

Checking the following assignments

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3

5

6

8