This image shows the topography of the seafloor in a larger view of the northwestern Pacific Plate. Note Hawaii in the lower right of the image.
A chain of islands and seamounts (submerged or eroded islands,
or volcanic rocks that never rose above sea level) that were
built over the hot spot extends far beyond the islands you
studied earlier. Part of the chain is called the Hawaiian
Ridge, and another section is called the Emperor Seamounts.
As with the Hawaiian Islands, the age of volcanic rocks on
each seamount increases with distance from Hawaii.
! Use the ruler tool to measure distances the plate has moved, and use the information to calculate rates of plate motion.