Understand 'atoll' as a geographical term for a specific type of island, not any island. While studying maps, we learned that Bora Bora is not just an island, but specifically an atoll.
Pro Tip 2/3
Natural Formation
An atoll is a natural formation, so using 'man-made atoll' would be incorrect. The teacher explained that atolls are formed by coral, not constructed by people.
Pro Tip 3/3
Lagoon Presence
Always associate atolls with a central lagoon; it's what distinguishes them from other islands. He was fascinated that each atoll in the aerial photo enclosed a tranquil lagoon.