Answer the following question given this paragraph: 

A chain of volcanoes forms as an oceanic plate moves over a hot spot. This is how it happens. A volcano forms over the hotspot. Since the plate is moving, the volcano moves off of the hotspot. When the hotspot erupts again, a new volcano forms over it. This volcano is in line with the first. Over time, there is a line of volcanoes. The youngest is directly above the hot spot. The oldest is the furthest away ( Figure below ).


Q: Volcano chains form as an oceanic plate moves over what?

 Choices:

- dust spot

- Water spot

- melt spot

- hot spot

A:
hot spot
