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How Stuff Works
http://science.howstuffworks.com/nature/natural-disasters/volcano-explorer-game.htm
There are many sites that provide animated explanations of scientific and natural phenomena. How Stuff Works, for example, has this explanation of a volcano erupting (Inside a Volcano).
NASA STEM engagement
The NASA website has a range of materials, particularly digital for use by K–12 educators and students. Topics relate to Space, Earth and Global Challenges.
Teaching the Language of Climate Change Science Extras (PETAA)
This site complements the publication by Hayes and Parkin (2021) and contains many resources collated to support teaching explanations in primary and lower secondary Science classrooms. These include video explanations of key concepts, infographics, analysed model texts and additional book lists.
YouTube
There are many explanations available on YouTube as well, such as animated explanations of physiological, biological, chemical and social systems such as digestion, food webs, and photosynthesis etc.