Chapter 1 : Introduction to Science
http://www.ars.usda.gov/is/kids/scientistsframe2.htm
http://oncampus.richmond.edu/academics/education/projects/webunits/measurement/#awards
http://www.infoplease.com/pages/unitconversion.html
Chapter 2 : Cell as a Unit of Life
http://www.cytochemistry.net/cell_biology/
http://cellbio.utmb.edu/cellbio/nucleus.htm
http://www.cytochemistry.net/cell_biology/membrane.htm
http://www.microscopy_uk.org.uk/mag/articles/parami.html
Chapter 3 : Matter
http://www.chem4kids.com/files/matter_intro.html
http://www.patana.ac.th/parents/curriculum/chemistry/units/LR103.html
http://www.usatoday.com/weather/wdensity.htm
http://www.sci.mus.mn.us/sln/tf/d/density/density.html
Chapter 4 : The Variety of Resources on Earth
http://www.ecologyfund.com/registry/ecology/res_kid_care.html
http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0030553.html
http://www.bbc.co.uk/scotland/education/bitesize/standard/chemistry/metals/reactivity_rev1.shtml
http://www.chem4kids.com/files/elem_intro.html
Chapter 5 : The Air Around Us
http://www.met.fsu.edu/explores/atmcomp.html
http://en.wikipedia.org/wiki/carbon_dioxide
http://www.telegraph.co.uk/news/main.jhtml?xml=news/2002/10/32/ncigs23.xml
http://www.physicalgeography.net/fundamentals/6c.html
http://science.exeter.edu/jekstrom/vt/XmasB/Xb.htm
Chapter 6 : Sources of Energy
http://www.nyu.edu/pages/mathmol/textbook/energy.html
http://www.energyquest.ca.gov/story/index.html#table
http://www.energyquest.ca.gov/index.html
http://www.eia.doc.gov/kids/energyfacts/index.html
http://www.fi.edu/fellow/fellow2/apr99/soundindex.html
Chapter 7 : Heat
http://www.schoolscience.co.uk/content/4/chemistry/copper/copch0pg4.html
http://www.greenhills-school.org/heat_energy.htm
http://www.encyclopedia.com/html/section/energy_types_of_energy.asp
http://www.physchem.co.za/Heat/Effects.htm#Effects
