| A | B |
|---|
| current | part of a fluid body moving in a certain direction. |
| Density Density | The mass of a substance per unit volume. |
| Break | 1c to curl over and fall apart. |
| Tide | The alternate rising and falling of the surface of the surface that occurs twice a day and is caused by the gravational attraction of the sun and moon one equally on different parts of the earth. |
| High Tide | The tide when the wThe tide when the water is at its greatest height. |
| Low Tide. | The tide when the water is at its lowest point. |
| Sea level | The height of the surface of the sea midway between the average high and low tides. |
| Wav length | The distance ( as from crest to crest) in the line of advance of a wave |
