Internal waves occur at the interface of two fluids of different densities. Part of what you will do is to document/ describe/explain what happens as these fluids interact, as it relates to the behavior of internal waves. Search for info on internal waves.

To construct your own device, use a clear bottle, either round or rectangular. If you can find a small, square bottle, such as the type used for some types of cooking sauces, you will get a little better representation of the interacting fluids. I've used a water bottle (round).

Rinse out the bottle and, if you can, soak off the label, then fill it with water and lay it on its side, to see if it is leak-tight. If it leaks, you can seal it with tape when it is filled.

Half fill the bottle with plain water, add a few drops of food coloring, and shake to mix. Blue is the most appropriate color, but any color will do to show the water mass boundary. (you can use jello too) Then, very slowly and carefully (so as not to create air bubbles), fill the bottle to the very top (almost overflowing) with mineral oil or vegetable oil (it will have some color - which is fine). Screw the lid on tight, tape it if necessary, and tilt the bottle slowly and gently.

Using your wave desktop device, answer the questions below. Think about how the various ways the layers interact.

Include photos of your work.explain your answers.

1. How are waves generated?

2. What is the source of a wave's energy?

3. What are some of the causes of waves?

4. Describe the action of a wave. Does a wave make the water move along with it, or does a wave move through the water?

5. How can waves be changed?

6. If something happens inside the bottle, does it affect all the water?

7. Would the motion of waves could carry and disperse pollution? EXPLAIN.

8. Where does the energy come from that moves the waves in your bottle?

9. Think back to your coffee and cream density stratification demonstration. What is the relationship between these two demonstrations?

10. Extra question --Why do the oil and water keep separate?

Wave simulator

https://www.physicsclassroom.com/Physics-Interactives/Waves-and-Sound/Simple-Wave-Simulator/Simple-Wave-Simulator-Interactive