Les 4 - intro §1.2 Rock changes

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 3

Welcome everybody

Take your own seat

Planning

• Homework check
• Start §1.2 rock changes
• making box 2a and 2b

Homework check

I will call the people I select to me if the instructions are over

I choose three of you

how did this rock break?

mechanical weathering

• By freezing and thawing of ice
• By vegetation, mainly their roots
  

what do you think has happened here?

Chemical weathering

• Some rocks react to water and oxygen
  
• Iron rusts
• Limestone (Kalksteen) dissolves in water
• This breaks down the rocks over time

Statement: In warmer climates more mechanical weathering takes place and in cooler climates more chemical weathering takes place

1. True
2. Not true

Not true

• Warmth and humidity accelerate the processes which cause chemical weathering
  
• The highest rates of mechanical weathering take place in areas which have temperatures below freezing during the night
  

Statement: If it is extremely cold almost no weathering takes place

1. True
2. Not true

Make the box about weathering

§1.2

Now it is time to check homework