Final answer:
Pahoehoe is the type of basalt flow with a billowy, ropy surface, seen in Hawaiian volcanic eruptions.
Step-by-step explanation:
The type of basalt flow that is characterized by a billowy, ropy surface is known as pahoehoe. This type of flow is typically associated with Hawaiian-type volcanic eruptions and is distinguishable by its smooth, unbroken surface that often resembles coiled ropes. In contrast, āā lava flows display a rough, jagged surface resulting from the lava breaking into clinkers as it moves, and columnar basalt is recognized by its polygonal fracture patterns as the lava cools and contracts. Lastly, a lava dome forms when viscous lava piles up around a vent instead of flowing outward.