If students are using resources from the internet, they need to be aware of Copyright rules and regulations. This is a great article that lists 30 sources of Creative Commons resources . The safest option is to use their own images, but here are some other options:
Animations
Students can create their own animations using "Pivot", "Kahootz" or "GoAnimate"
Here are some great examples of science animations from Bristol University.
Audio
DanoSongs is a Royalty Free Music site where you can download a wide range of music with attribution to the writer.
Students can use "Audacity" (free software) to record their own voice, edit and save for video tracks.
Some online sites (Voicethread, Voki, Blabberize) allow you to record and save audio online.
Avatars
It is useful for each student to create their own avatar at the beginning of the year, that they can use in place of a photograph. An avatar is required for programs such as Voicethread, Facebook, Twitter and others. There are hundreds of different tools (do a Google Search) but some of my favourites are:
Build Your Wild Self
Portrait Illustration Maker
WeeWorld
Lego Avatar Creator
Cartoons
"Comic Life" (paid, download) and "ToonDo"(free, online) are two tools that can be used to create cartoons.
Creative Commons Images
Creative Commons Search
Wikimedia Commons
Flickr Creative Commons
Images
Students can take their own photographs and edit them in "Irfanview", "Picassa" or "Photoshop". They can also create their own images in "Paint" or using an iPad app such as 'Draw'.
Story Books
"StoryJumper" and "StoryBird" are two sites where students can create their own stories by writing the text and adding images from a data base. They can also upload their own clip art and images. The books are saved online or can be printed.
Video Tools
"Windows Movie Maker","iMovie", "Reel Director" (for iPods and iPads), "Animoto" and "Photostory" are just some of the tools that students can use to edit and create videos.Students can create videos for the 60second science video competition, or try the Parks Victoria Wetlands video competition at http://enviroactiv.com.au/competition.html
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Science.TV is a site where you can learn how to create your own videos about science experiments, interviewing scientists or explaining a concept. It has free templates for storyboards and other tips and tricks to get you started.