Volcanoes along convergent ocean plate boundaries may form

Most volcanoes form along 1. diverging plate boundaries such as mid-ocean ridges & also on land as in the Great Rift Valley in East Africa. ... converging plate boundaries where subduction takes place. Many volcanoes form near converging plate boundaries where oceanic plates return to the mantle.

Explanation:

As you saw in the video, the geological activity that forms volcanoes also produces valuable materials, such as gold, sulfur, and diamonds. However, not all volcanoes occur on land. The volcanic activity along oceanic plate boundaries can also deposit valuable metals and minerals along the ocean floor. In your own words, briefly compare and contrast the possible environmental impacts of mining underwater volcanoes versus land-based volcanoes.

Edmentum sample explanation:

Mining, whether underwater or on land, is likely to create pollution that will adversely affect the nearby wildlife.  However, the types of pollution, and thus the specific environmental impacts, are likely to vary somewhat since different equipment and technology will be used to mine the different locations.

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