Home Made Lava Lamps

In P4, we have been doing a lot of things in the science lab lately. One of the many experiments we have done is the 'Bubbles in a Bottle' experiment. What you did was you filled a clear bottle up with about 1\5 of water and the rest with canola oil. You then drop any colour of dye you want into the bottle, wait until it hits the water and then drop an Alka-Seltzer tablet into the bottle. This has been one of  my favourite experiments so far. To turn this into a challenge, we formed a question and then a hypothesis. Our question was 'Would the temperature of the water effect the amount of bubbles that rise'? and our hypothesis was correct. We all had a fun time.