Answer:
Hot spots and moving tectonic plates.
Step-by-step explanation:
The earth crust is made up of moving tectonic plates. Sometimes at the point where these plates come together, volcanoes form there, but also forms at the middle of the tectonic plate. The volcano erupts and the magma rises and erupts on the seafloor in a spot called the "the spot hot".
The hawaiian islands were formed on the concept of the hot spots in the pacific ocean, where the hot spot are fixed, but the tectonic plates still moves. As the plates move over the hot spots, the hawaiian islands are formed.