Related Clues:

• Parabola, essentially
• Bow-shaped line
• Semicircular shape
• Mauna Loa output
• Soft rock
• Mount St. Helens spew
• Long pass path
• Ellipse bit
• Rolling rock?
• Volcano flower
• Compass trace
• Slow-pitch path
• Soft rock?
• Cissoid segment
• Plane path