The Hawaiian islands are a conveyor belt printing volcanoes as it moves

Hawaii sits above a fixed plume of rising magma while the Pacific plate slides slowly over it, so instead of one drifting volcano, the hotspot has stamped out an entire chain of islands and seamounts stretching over 3,600 miles. Each island gets progressively older heading northwest, letting geologists read the plate's speed and direction off the map.

— Wikipedia contributors, Hawaiian–Emperor seamount chain — Pacific Ocean