LAVA LAMP!!

 At science we learnt about that the Oil rises to the top is because oil is lighter then water.The reason the bubbles were rising and dropping when the bubbles were rising because they releasing Carbon dioxide and when the bubbles were dropping they were getting  more Cordon dioxide to bring to the surface.

BATH BOMB !!!

At science we learnt about that the When a bath bomb comes in contact with water, the baking soda and citric acid react to make carbon dioxide bubbles. This is an acid–base reaction, where baking soda (also called sodium bicarbonate) is a weak base and citric acid is a weak acid.