Geologists have discovered a massive 20-km thick chunk of buoyant rock beneath Bermuda, solving a long-standing geological mystery. The feature explains a long-standing geological mystery. Geologists have discovered a massive 20-km thick chunk of buoyant rock beneath Bermuda, solving a long-standing geological mystery. The feature explains a long-standing geological mystery. New Delhi: The archipelago of Bermuda rises as a prominent sw... [1127 chars]