3rd Grade Units of Study

Solar System

Fact Monster - The Solar System
Enchanted Learning - All About Our Solar System
Kids Astronomy.com
Structure of the Sun (Enchanted Learning)
NASA Space Place - Explore the Earth and Space!
Crash Course Kids - a YouTube channel

Symbol of the United States

Uncle Ben's Guide to Symbols of the U.S. Government (K-2)
Uncle Ben's Guide to Symbols of the U.S. Government (3-5)
Symbols of the USA - Enchanted Learning
Calculate your weight on other planets!

Biomes

Ask a Biologist
Wetlands Fact Sheet from Defenders of Wildlife
Animals A to Z
World Biomes
Biomes of the World - Missouri Botanical Gardens

Biographies

Ducksters