My assertion is that the geological feature on the surface of the Earth known as "The Ring of Fire" was caused by the same impact event that created the Moon.
The evidence for this idea is the following:
1. The circular shape of this feature implies it may have been formed by the collision of two spherical objects
2. The size of this circular feature implies the colliding object must have been so big it could only be the collision that also formed the Moon.
3. The strength of this impact was so great that it dented the mantle of the Earth, allowing crust features like the plates to slide around above it while maintaining the circular impact remnant.