Related Clues:

• 'Gnarly!'
• Pump up the volume
• Physicist Georg Simon --
• "Gnarly!"
• Force unit
• Chain reaction pioneer
• Band accessory
• Dyne-centimeter
• X-ray unit
• Far out!
• More than cool
• Circuit breaker word
• Resis-tance unit
• Current unit, for short
• It's for the Byrds