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Animals
What will I be when I grow up?
Match baby animals with their grown up versions
Plants
Space
As the Earth Turns
What causes day and night?
Earth Materials
Rocks and Soil
Harcourt Science
http://harcourtscience.com
Macmillan Science
http://www.macmillanmh.com/science
Water
Thirstin's Water Cycle
Earthguide Water Cycle
Zoo Web Cams
San Diego Zoo