A giant lava lamp inside the Earth might be flipping the planet's magnetic field
14.5" Lava Lamp - Lava Lite : Target
Ceramic Candle Lava Lamps – Glow!
Amazon.com: Lava Lamp 14.5 inch Northern Lights Lamp,Plastic, Purple/Blue, 21600400UK : Tools & Home Improvement
Tricolor White and Clear Lava® Lamp | 14.5" Inches Tall | Aluminum Base and Cap with 25W Bulb Included | Classic/Vintage Liquid Motion Lamps | Multi-Colored Dynamic Blob Effects - Amazon.com