1. Sea Levels are linked to the Earth’s temperature.

2. For example, if the temperature goes down The sea level drops.

3. If the temperature goes up, The sea level rises

4. Rising sea levels are dangerous for people living near the coasts.

9. Another danger for people living on the coasts are Tsunami waves.

10. What is a tsunami? A tsunami is a large ocean wave usually caused by an underwater earthquake or a volcanic explosion .

11. There are a lot of islands where people use the coral reefs to make walls and buildings.

12. These people used coral reefs to make this building.

13. Cement walls