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)

Hot spots come from deep, relatively fixed heat sources in the mantle. Mantle plumes rise from deep in the mantle and stay in roughly the same place as the lithospheric plate moves overhead. This fixed heat source, like the lamp in a lava lamp, creates volcanic activity where the plume reaches shallow depths, and as the plate drifts, a chain of volcanoes or seamounts forms with age progressing away from the current hotspot location. That’s why describing mantle plumes as stationary heat sources is the best fit for how hot spots operate. The other ideas don’t match how hot spots behave: they don’t move with tectonic plates, they aren’t guaranteed to produce the same magma type everywhere, and they aren’t physically connected to the crust or migrating with it.

Hot spots come from deep, relatively fixed heat sources in the mantle. Mantle plumes rise from deep in the mantle and stay in roughly the same place as the lithospheric plate moves overhead. This fixed heat source, like the lamp in a lava lamp, creates volcanic activity where the plume reaches shallow depths, and as the plate drifts, a chain of volcanoes or seamounts forms with age progressing away from the current hotspot location. That’s why describing mantle plumes as stationary heat sources is the best fit for how hot spots operate.

The other ideas don’t match how hot spots behave: they don’t move with tectonic plates, they aren’t guaranteed to produce the same magma type everywhere, and they aren’t physically connected to the crust or migrating with it.