6th Grade Science - Interactions within an Ecosystem

 (Cause and effect relationships, interaction of biotic and abiotic components of ecosystems, predatory and mutually beneficial relationships in an ecosystem, food webs)

 Khan Academy  What is an ecosystem?
 eSchool Facts about ecosystems
Biomes World biomes and ecosystems
Geography4Kids The biosphere and ecosystems
Learn About Ecology Biotic and abiotic factors
National Geographic Learn about food chains and food webs