Final answer:
The Colossus of Rhodes was the ancient wonder toppled by an earthquake around 225 BC, which stood at the entrance to Rhodes' harbor and symbolized the sun god Helios.
Step-by-step explanation:
The ancient wonder of the world that was toppled by an earthquake around 225 BC is the Colossus of Rhodes. This statue was one of the Seven Wonders of the ancient world, much like the Hanging Gardens of Babylon and the still-standing Great Pyramid of Giza.
The Colossus was a massive statue that stood at the entrance to the harbor of the island of Rhodes in Greece. It was a representation of the sun god Helios and took 12 years to complete before its destruction. Unlike the Great Pyramid of Giza, which remains today as the last of the ancient wonders, the Colossus of Rhodes no longer exists.