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Inform them the required phases in the garden and through funny examples.
Physics is byond my scope of knoelwdge so I cannot provide any answer
VERY GOOD SIGN to see such curiousity in delivering duty.
There are lot of fun science activities available in websites. For example you can teach the effects of heat using a tin container covered at the top by balloon gets inflated on heating. Have a plenty of fun and love in teaching science. Best wishes for a better future.
Thank you.