1. Our hypothesis is that, we have to pour ⅔ vegetable oil in the bottle because the oil is less dense so it stays up. The water is denser than the oil causing it to sink. When the water floats up for a while in the form of bubbles (because of the Alka-Seltzer tablets) there's more time for us to watch the bubbles float through the oil before they reach the surface and pop.  
2.   Maybe, also because if there's more water than oil it will be hard to watch all the bubbles at the same time.      

Why do we have to use a lot of vegetable oil to conduct the experiment?

While making this experiment we used the 3 variables (Independent, Dependent and Controlled variables). 

Independent variable: The temperature of the water used in the experiment.

Dependent variable: The dependent variable is the bubbles.

Controlled variable: All the materials are the controlled variables (except water).     

 Variables are essential in making scientific experiments. They are why every experiment takes place!

1. Fill the Container: Fill about ⅓ of your bottle or jar with water.
2. Add Colour: Add a few drops of food colouring to the water. Stir to mix the colour evenly.
3. Add Oil: Slowly pour vegetable oil into the container until it is almost full. You’ll notice that the oil and water will separate, with the oil sitting on top.
4. Effervescent Magic: Break a Alka-Seltzer tablet into a few small pieces. Drop one piece into the bottle and watch the fun begin!
5. Observations: As the tablet dissolves, it will create bubbles that carry the coloured water up into the oil. When the bubbles reach the top, they pop, and the coloured water falls back down. You can keep adding pieces of the tablet to continue the effect.
6. Optional Decoration: For extra flair you can add glitter or small decorative objects before dropping the Alka-Seltzer tablet. 

Cold water 

• You could only hear the noise if you put your ear really close to it or sometimes you couldn’t hear it at all.  So you could just say there was no noise.
• Their were only small bubbles.

  Room Temperature water

• There was only a medium amount of noise, more than the cold water experiment.
• There were medium bubbles.

  Hot water

• There was a lot of noise.
• The bubbles were also really big.

The first hypothesis that indicated more room for the bubbles was correct. As the bubbles needed more room to be seen. 

 But the second one that said the bubbles would form at once and it will be hard to see them if there's less oil was incorrect. That's because the bubbles did need more space but they didn’t form all at once (meaning there was still a bit of oil left at the bottom). 

 So, the first hypothesis was correct because the reason (more room for the bubbles) was correct. While the second one that said the same thing (more room) was incorrect because it’s reason was incorrect.

Our experiment is highly dependent on the Alka-Seltzer tablet, but not completely, it also uses other materials (bottle/jar, vegetable oil, water, food colouring and glitter or other small objects). It is also very easy to make it.   

Lava lamps can be used for a mean of relaxation or to bring astonishment to someones eyes. They can be interesting and fun while making by one's own hands. Who can be easy to make at home!

We made many mistakes while conducting the experiment, like:

•   Firstly, I (Goldy) put too much water in the jar so I poured the extra water out, then I realized there was too little water in the jar, then I just didn’t mind and I continued the experiment, and the experiment went great. It didn’t matter only because I had only a little less water than needed.

• Secondly, I (Goldy) also forgot to add the glitter before doing the first test, so I now have account of how it works in both situations. 
• I ( Jessie) poured less vegetable oil when first conducting the experiment so I poured more vegetable oil to fix the problem, and it worked! The experiment went smoothly.
•  
• I (Jessie) also poured less food colouring while conducting the experiment so I put more food coloring to finish the experiment.

•   

• I (Jessie) also made another mistake. I put all the ingredients in the bottle and shook the bottle to mix the ingredients. When I added the tablet it floated to the top. So I had to do the experiment again.

https://www.imdb.com/name/nm0444072/bio/

https://www.lampsplus.com/ideas-and-advice/10-fun-facts-about-the-lava-lamp/ 

https://www.reddit.com/r/askscience/comments/93hv7r/how_do_lava_lamps_work/?captcha=1

 We would like to acknowledge some people and resources that have helped us in making this project:  our parents, Ms.Bains, Mehreen, Keerat, Jessie’s older brother, Ms.Navgeet, Ms.Michelle, Pavit, Hazel and Ms. Fauzia.

Some apps: Google, G.Translator, Ciplot, Microsoft Edge, Youtube, Microsoft Bing, and Chrome.