1. The shelf typically ends at a very steep slope, called ________

2. The Coral reefs are a major characteristic of:

3. ______ a mountain with pointed summits, rising from the seafloor that does not reach the surface of the ocean

4. A mid-ocean ridge is an underwater mountain system formed by

5. Along the coasts, salinity is:

6. The geographers have divided the oceanic part of the earth into ______ oceans.

7. Which one of the following is the smallest ocean:

8. Salinity refers to the total amount of

9. Which one of the following is not a minor relief feature in the oceans:

10. ________ is the extended margin of each continent occupied by relatively shallow seas and gulfs.