How to Use "reef" with Example Sentences

1. The problem is the number of challenges facing the reef .

2. But a changing environment could put the reef 's future in jeopardy .

3. The challenge scientists face is to keep the reef healthy despite rapid change .

4. The reef is a very popular destination for scuba divers and other tourists .

5. During a 2010 bleaching episode an international team studied three coral reef sites .