Final answer:
Lava and ash create landforms called lava plains.
Step-by-step explanation:
Lava and ash create landforms called lava plains. When lava flows rapidly from long cracks, it can spread out and form flat plains. The largest known terrestrial eruptions, such as those that produced the Snake River basalts in the northwestern United States or the Deccan plains in India, are examples of lava plains. These landforms can also be found on the Moon and other terrestrial planets.