An underwater volcano that has not reached the surface of the ocean is called a __ Island ares Seamount mid-ocean ndge guyot

## Step 1<br />The question is asking for the term that describes an underwater volcano that has not reached the surface of the ocean. <br /><br />## Step 2<br />The options provided are Island arc, Seamount, Mid-ocean ridge, and Guyot. <br /><br />## Step 3<br />An Island arc is a chain of volcanoes that are formed on the ocean floor, but they are not underwater volcanoes. <br /><br />## Step 4<br />A Mid-ocean ridge is an underwater mountain range formed by plate tectonics, but it is not a volcano. <br /><br />## Step 5<br />A Guyot is a flat-topped seamount, which is a type of underwater mountain, but it is not a volcano. <br /><br />## Step 6<br />A Seamount is an underwater mountain that rises from the ocean floor but does not reach the surface. It is formed by volcanic activity and is therefore the correct answer.