Chapter 7

1. A tidal wave is a very large and .............. wall of water.

2. A tidal wave comes ................ in suddenly and unexpectedly at any time.

4. Do you know that tidal waves are not caused by.........?

4. When an earthquake takes place under the ocean, the ocean floor shakes and .......

5. Sometimes, the ocean floor ............. during an underwater earthquake.

6. A double-wave tsunami can also be called a ........................ tsunami.

7. In 2011, a ................. earthquake occurred off the coast of Japan.

8. A tsunami caused a ....................... at a nuclear plant in northeastern Japan.

Today scientist can ....................... that a tidal wave hit land.

10. It is possible to .......................... people that a tidal wave is coming.