Just spoke to my wife who taught grades 1 and 2 for 20 years.
- you need to find a way to keep their attention and focussed on what you are saying. Their attention span at that age is minimal.
- don't give them the rocks until the end of your talk, or that's all they will be thinking about.
- get the kids to form a semi-circle, around you at the front of the room, sitting on the floor. You should be at approximate eye level.
- use one or more simple diagrams that you can speak to eg. a cross-section of the mine, etc.
- keep it short and simple.
- you could ask them if they have any questions at the end of your talk.
- it would probably help if you gave them a cloth sample bag to put the rock in.
As a geologist, I used to take cubs to Drumheller to collect dinasaur bones back in the 70's. On one trip they filled up over 100 sample bags.
Hope this helps. Best of luck.
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