- Crest- the point on the medium which exhibits the maxium amount of positive or upwards displacement from the rest position.
- Trough- the point on the meduim which exhibits the maxium amount of negative or downwards displacement from the rest position.
- amplitude- the maxium amount
http://static.howstuffworks.com/gif/tsunami-wave.gifp://
www.physicsclassroom.com/Class/waves/
U10L2a?.html
