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A large collection of free videos, lesson plans, interactive tools, and more. Science content covers earth and space science; life science; physical science; practices and nature of science; and instrumentation, measurements, and units. Filter by grade level and type of resource. Some lesson plans follow the 5E Learning Cycle.
National Geographic Education's mission includes two goals: 1) the promotion of geo-literacy and 2) educational outreach. This website includes interactive map-making tools, environmental literacy teaching guides, and other valuable resources/content.
Wealth of (mostly free) information and resources for K-12 STEM education, this digital library acts as an "aggregator" for partner content. From their website: "Most resources in the library adhere to principles of Open Educational Resource (OER) access, although some resources are restricted to provider site membership, or may have a cost associated with them (indicated in the full record of the resource)."