Rocks:

http://www.classzone.com/books/earth_science/terc/content/investigations/es0602/
es0602page01.cfm?chapter_no=investigation

http://www.rocksandminerals.com/rockcycle.htm

http://www.windows.ucar.edu/tour/link=/earth/geology/rocks_intro.html

http://www.moorlandschool.co.uk/earth/rockcycle.htm

http://www.minsocam.org/MSA/K12/rkcycle/rkcycleindex.html

http://www.chariho.k12.ri.us/curriculum/MISmart/ocean/rocksong.htm

http://www.beyondbooks.com/ear82/7.asp

http://sln.fi.edu/fellows/payton/rocks/create/index.html

http://www.windows.ucar.edu/tour/link=/earth/geology/rock_cycle.html

Water Cycle:

http://www.kidzone.ws/water/

http://ga.water.usgs.gov/edu/watercycle.html

http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Watercycle.shtml

http://www.epa.gov/safewater/kids/flash/flash_watercycle.html

Cells:

http://www.cellsalive.com/

http://www.cellsalive.com/cells/animcell.htm

http://www.purchon.com/biology/cells.htm

http://www.enchantedlearning.com/subjects/plants/cell/

http://library.thinkquest.org/12413/structures.html

http://www.biology4kids.com/files/cell_main.html

http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/cells.htm