thexplainmatrix.io on Instagram: "Ever seen a rock move across a frozen lake like it’s a hot knife through butter? 🧊🔪 This viral video shows a “rolling rock” appearing to slice a perfect line through a thin sheet of ice, and the explanation is a fascinating mix of physics and acoustics. When a rock rolls or skips across thin ice, it creates a phenomenon known as acoustic dispersion. Because ice is a solid medium, sound waves travel through it differently than through the air. High-frequency wa