Io

1) http://nineplanets.org/io.html

2) http://www.planetary.org/explore/topics/jupiter/io.html

3) http://www.astrobio.net/exclusive/3518/the-chance-for-life-on-io

Mars

1) http://nineplanets.org/mars.html

2) http://www.youtube.com/watch?v=pWbCeveFptA

3)http://www.seasky.org/solar-system/mars.html