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IRIS: What is a hotspot?
http://www.iris.edu/hq/programs/education_and_outreach/animations/21
On this IRIS animations page, two narrated animations are presented to explain how hotspots form and how a single island in a hotspot chain evolves over time.
This resource is referenced here:
DIG Texas Blueprints:Unit Collection: Plate Tectonics: Earth in Motion
DIG Texas Blueprints:Unit Collection: The Dynamic Earth: Plate Tectonic Processes