Book Work
Title in books – Weathering and Erosion (UNDERLINE)
Use your books to find the formal definitions of weathering and erosion.
Look in the Glossary at the back of the book (Class 8T not told where to look)
Partner Work
Use these definitions to explain the difference between the two to a non scientist, pretend the person sitting next to you is a non scientist and take it in turn to explain!
State time limit 10 minutes
Circulate the class to help students who are struggling and to listen in on some explanations.
Board Work and Teacher Explanation
Bring the class back together to confirm definitions and difference.
Three different types of Weathering – sub-heading in book
There are three different types of weathering
1. Physical Weathering
2. Biological Weathering
3. Chemical Weathering
Write these in book
Teacher Explanation
Show colour acetates of photographs that demonstrate the affect acid rain has on statues and buildings made of different types of rocks.
Explain how acid rain is caused and the consequences of acid rain.
Acid rain acetate – allow pupils time to copy the key points off the acetate.
Colour in the rain red to signify that this is chemical weathering.
Partner Work
Ask the children to think about why some of the rocks have been weathered much more than others talk to the person next to you about a possible explanation?
Time limit 5 minutes
Worksheet
Gain class attention (I am waiting for silence, and then use individual pupil names if necessary)
Wait for total silence and whole class attention before you tell them you will be handing out a worksheet with the following questions on to be stuck into the children’s books.
Acetate
Rain water is naturally slightly acidic. Carbon dioxide from the air dissolves into the rain water turning it slightly naturally acidic.
Carbon dioxide + water = carbonic acid
Fossil fuels contain sulphur, when they are burned they produce sulphur dioxide. When sulphur is burnt in air this happens!
Sulphur + oxygen = sulphur dioxide Sulphur dioxide is acidic!
Sulphur dioxide dissolves into rain water to produce an acid called sulphuric acid this very acidic!
Rocks containing calcium carbonate will be weathered most quickly by acid rain because the carbonate reacts with the acid in the rain
Fast finishers to read about consequences of acid rain on page 45.
Class Practical
Gain class attention Count to three, eyes and ears on me!
Praise those as they begin to pay attention with each number counted down – one – well done girls thank you, Two – good back row, Three!
Tell this background story for the experiment:
It is the year 3000 & rain water has become extremely acidic due to all the fossil fuels being burnt! Houses are being weathered away by the second; this has major implications for the economy of Britain “ask what economy is”. The Government has employed you to discover which rock they should build houses out of in order to prevent this type of weathering ruining all their future building work!
You must carry out an experiment to test Granite, Limestone, Sandstone, Chalk and Marble.
Provide the class with a worksheet that reiterates the story and the experiment they are to carry out. (See Appendix 1)
Carrying out the Practical
Vicky to hand out 8 glue sticks (know how many go out count them back in)
Use pages 14 & 15 to answer the following questions state 10 min time limit.
Alex to hand out the worksheets
A bucket has been placed at the front to empty used rock samples into.
One jar of acid rain will be placed on each bench.
One jar of each rock will also be placed on each bench.
You shall be working individually for this experiment at your own work bench.
Santosha to give out the glass dishes 28
Nick to give out the pipettes 28
Rachael to give out the stop clocks 28
I Will Demonstrate how to Carry Out Experiment
Carry out the experiment and then clear away all practical equipment once you have completed the experiment.
Writing the Report
Following this write a report for the government saying what you had to do, what you discovered and state which rock they should build houses out of and why!
Everyone who finishes the report 20 minutes before to the bell will get a merit.
Fast finishers are to write a poem about acid rain to give other children a chance to catch up before the plenary session.
Plenary Session
Plenary session involves white boards to be used for a question and answer session
Exercise books to be collected in today pass them to the inside end of the benches along with the text books and will Nick, Adam, Jason and Michaela please bring them to my desk.
Some of the words children will be tested on placed on OHT a few minutes to revise while I check the homework’s – those who have not completed the homework will be asked to stay behind after this lesson and complete. (BREAK-TIME)
White board Questions
What type of weathering is acid rain?
Rain water is naturally acidic, what dissolves into rain water to produce this slight acidity?
What dissolves into rain water to cause acid rain?
Which rock would be best to build houses out of in order to withstand the affects of acid rain?
Which rock would you not want to build houses out of with consideration to acid rain?
What do the rocks which react most readily with acid rain contain? (slightly harder question)
What is this a definition of
- Wearing away of rock by a physical or chemical process
- Wearing away of rock while it is being transported
Dismissal of Class
Stand behind benches ask Vicky, Lee, Jamie and Danny to check the sinks - which row will be the first to go?
Dismiss rows in the order in which they became silent first.
