TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: Solids have a fixed volume and a fixed shape. Liquids have a fixed volume but take the shape of their container. Gases take both the volume and the shape of their container. Answer: gases

SOLUTION: What takes both the shape and the volume of their container?

PROBLEM: Passage: Refracting and reflecting telescopes are optical telescopes that use lenses to gather light. Answer: light

SOLUTION: Refracting and reflecting telescopes are optical telescopes that use lenses to gather what?

PROBLEM: Passage: 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 ). Answer: hot spot

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