Here you have some activities and videos:
The Universe and the Earth:
Pictures of terrestrial and gas giant planets:
http://www.youtube.com/watch?v=ssA7Ew_BQHY
http://www.youtube.com/watch?v=ssA7Ew_BQHY
Video where you can see the explanations of seasons due to the revolution of the Earth: http://www.youtube.com/watch?v=95TtXYjOEv4
In this one, you can see how the rotation of the Earth around its axes is the cause the day and night: http://www.youtube.com/watch?v=k-oLJxjCzBg
Here you can see the moon phases: http://www.sumanasinc.com/webcontent/animations/content/moonphase.html
and here why we always see the same side of the moon http://www.youtube.com/watch?v=exIpL0Uhr_k
A review: http://www.youtube.com/watch?v=ssA7Ew_BQHY
Here it is a lunar eclipse: http://www.youtube.com/watch?v=iC9RcpLO43s
and a solar eclipse http://www.muyinteresante.es/ciencia/video/video-icomo-se-produce-un-eclipse-solar
Animals
A video about the ambulacral system of the echinoderms http://www.youtube.com/watch?v=lyRWDjfSPGU
A presentation with a review of invertebrate animals http://www.slideshare.net/laprofedenaturales/unit-5-invertebrates
And another that includes vertebrates http://www.slideshare.net/leannebenson/vertebrates20and20invertebrates-1
Hydrosphere
Slide presentation:
http://www.slideshare.net/Alyssa10/earth-science-hydrosphere-ppt