Categories (from the website):
March 14, 2014
13-15, 16-18, or 19-21
Writing (article of up to 1000 words), Photography (a single photo or photo essay of up to 12 photos), Video (up to 3 minutes in length, in documentary or reporter/interview style)
The website includes tips for choosing a topic and provides other helpful information for contest entrants.
Check out the winning entries from last year here.
Specific requirements for competition entries are available online.