2. There are two types of
explanation :
How do things work?
Why do things happen?
3. How does a plane fly?
How does a car engine work?
How does a pigeon find its way
home?
How do you fly a hot air
balloon?
How is honey made?
How do they print bank notes?
4. Why does the moon seem to
change shape?
Why do we pay tax?
Why was there an earthquake in
Japan?
Why do we count in the way we
do?
Why are there 60 seconds in 1
minute?
6. Intro
• Introduction – Glass bottles
• What are they made from?
How do we get the
materials?
Collection
• What happens to old glass
bottles?
• Recycling old glass.
Collection and crushing.
Processed
• What happens to the
crushed glass?
• Bottle factory – silica sand –
melted – lower temperature.
7. Manufacture
• How are the bottles
made?
• Hot liquid glass –
machinery – bottles.
Conclusion
• Conclusion
• Advantage of
recycling glass – why
do we do it?