Final answer:
Nonviolent eruptions characterized by extensive flows of basaltic lava are termed lava plains. These eruptions occur when lava spreads out rapidly from long cracks, forming vast areas of flat, basaltic lava flow.
Step-by-step explanation:
Nonviolent eruptions characterized by extensive flows of basaltic lava are termed lava plains. These eruptions occur when lava spreads out rapidly from long cracks, forming vast areas of flat, basaltic lava flow. Lava plains can be found on Earth, as well as on the Moon and other terrestrial planets.