Which statement about hot spots is correct?

Which statement about hot spots is correct?

• A. Hot spots move with tectonic plates
• B. Mantle plumes behave like lava lamps and hot spots are stationary heat sources
• C. All hot spots produce the same magma type
• D. Hot spots are connected to the crust and migrate with it

Answer: (B)

The key idea is that hot spots come from deep mantle plumes that rise as localized, relatively fixed heat sources, while tectonic plates move over them. As a plate travels over a plume, magma melts in the mantle and erupts at the surface to form volcanoes, leaving behind a chain that records the plate’s motion.

That’s why the statement about mantle plumes acting like a lava lamp is the best description: the plume is a concentrated, buoyant column of hot material rising from deep in the mantle, and the hot spot itself stays in roughly the same place while the overlying plate moves. The surface volcanism marks a fixed location, producing a line of volcanoes as the plate sweeps over the plume.

Other ideas don’t fit this pattern. Hot spots aren’t carried along with the moving plate; they’re not connected to the crust; and the magma types can vary depending on the plume’s composition and interactions with the crust, so not all hot spots produce the same magma.