Answer:
Underwater volcanoes
Step-by-step explanation:
The Hawaiian Islands are a result of underwater volcanic activity - countless eruptions of over several million years. This activity still takes place at an undersea magma source called the Hawaii hotspot and continues creating new islands. The tectonic plate beneath this part of the Pacific Ocean continually moves while the hot spot remains still. As a result, new volcanoes are created. Today, four of these volcanoes are active, two are dormant, and more than 123 are extinct.