1.2 Rock changes

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Recap 1.1 Mountains are formed, mountains wear down
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Instruction 1.2 Rock changes
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AardrijkskundeMiddelbare schoolvwoLeerjaar 2

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Today
Recap 1.1 Mountains are formed, mountains wear down
Check homework

Instruction 1.2 Rock changes
Get started with assignments

Slide 1 - Diapositive

Slide 2 - Diapositive

Plate tectonics
Plates can move in three different ways:
  1. Towards each other: convergent
  2. Away from each other: divergent
  3. Alongside each other: transform

Slide 3 - Diapositive

Old and young
The Himalayas
  • young mountains
  • high sharp peaks
  • deep valleys

The Scottish Highlands
  • old mountains
  • worn-down peaks
  • low height differences



Slide 4 - Diapositive

Check homework
1.1: 1, 2, 3, 6

Slide 5 - Diapositive

Weathering
The Himalayas and the Andes have much relief.

Mountain tops slowly break down. This is called weathering.

Slide 6 - Diapositive

Mechanical weathering (1)
  1. cracks and crevices are filled with water after a rain shower
  2. the water expands as it freezes
  3. cracks and crevices slowly get bigger
  4. eventually the rock breaks

Slide 7 - Diapositive

Mechanical weathering (2)
  1. the rock expands when it is heated by the Sun
  2. the rock contracts when the temperature drops below zero

What will eventually happen to the rock?
The rock will crumble.

Slide 8 - Diapositive

Mechanical weathering (3)
  1. plant roots grow between cracks
  2. as the roots get wider, the rock may crumble

Slide 9 - Diapositive

Chemical weathering
Old buildings and statues show traces of chemical weathering.

The speed at which this chemical weathering occurs depends on the climate.

.

Slide 10 - Diapositive

Chemical weathering
In a warm, humid climate, the chemical weathering process is faster than in a cold, dry climate.

Slide 11 - Diapositive

Caves
Caves are created by chemical weathering.

There is limestone below the surface of the Earth. Limestone dissolves faster in acidic water than most rocks.

In the Netherlands caves are found in ?
  • Limburg (southern part)

Slide 12 - Diapositive

Place the processes in the correct order.
1
2
3
4
Precipitation becomes acidic by plant roots
Limestone dissolves
Precipitation falls
Precipitation seeps down through the rock

Slide 13 - Question de remorquage

Get started
1.2 Rock changes: 1, 2, 3, 8

Finished early? Improve your map skills: workbook p. 6 and 7 

Slide 14 - Diapositive

Next week
1.3 Rock is moved

Homework:
1.2 Rock changes: 1, 2, 3, 8

Slide 15 - Diapositive