The University of New South Wales is hosting the Bragg Student Prize for Science Writing. It is an essay competition aimed at students in years 7 to 10 from all states in Australia, which asks students to write an essay (800 words or less) about a great Australian invention or discovery. Teachers' notes, information for parents and consent forms as well as hints and tips for students are found on the website.
Applications close on 26 August, so there is plenty of time to get you students involved.
The student competition is part of the annual Bragg Science Prize.