10. Since estuaries protect animals and plants and prevent erosion, protect them is very important.

9. Here, animals can enjoy all the benefits of the oceans without having to face much of its dangers.

8. This mixing of fresh and salt water creates a unique environment is filled with life of all kinds.

7. The creatures on the ocean floor manage to survive without sunlight and getting energy from other sources.

6. The water in the ocean also keeps the temperature of the earth steadily by absorbing and releasing heat.

5. Heat capacity is the amount of energy that takes to raise the temperature of a substance one degree centigrade.

4. The density of pure water is 1000kg/m, meaning that one cubic meter of water weighs for one thousand kilogram.

3. The nutrients in whatever falling into the ocean will quickly become available to their living creature.

2. Water is a liquid at room temperature and has a relatively high frozen point.

1．Water is actually quite simple, but the way how the water molecule is formed gives water its unique properties.