The two correct answers that accurately describe the effects of the coral reef being deeper underwater due to rising sea levels are:
- The coastline now has less protection against erosion.
- The coral reef now has less protection against deposition.
As sea levels rise and coral reefs are submerged deeper, the protective barrier they provide to the coastline diminishes, making it more vulnerable to erosion. Additionally, the change in depth may also affect the coral reef's ability to help manage the deposition of sediments.