This interactive, educational website about our universe and planetary systems was created by the University Corporation for Atmospheric Research and is supported by NASA and the National Science Foundation (NSF) among others.
Why UDL?
The glossary in "Windows to the Universe" is an excellent example of providing options that define vocabulary. Embedded links to the glossary give students immediate access to definitions of unfamiliar terms.
ESOL Online has a helpful list of strategies for activating prior knowledge that are useful for multilingual or monolingual classrooms.
Why UDL?
The strategies listed on the ESOL site, such as concept maps, KWL charts, and graphic organizers, are effective examples of ways to activate and supply students' background knowledge.