1. (deep) part of the ocean is almost 11,000 meters long.

2. (high) waterfall is 979 meters.

3. (long) river is 6,992 km in length.

4. (large) freshwater lake is 82,100 km2.

5. (biodiverse) forest holds over a million species.

6. (old) mountain is 3.6 billion years old.

7. (big) ocean is 723,000 square kilometers.

8. (active) volcano has been erupting continuously since 1983.