You will need to make a homemade lava lamp:
A clean 1 liter clear soda bottle
3/4 cup of water
Vegetable Oil
Fizzing tablets (such as Alka Seltzer)
Food coloring
For More Project Ideas: http://sciencemelaprojects.blogspot.com
Panah Science Mela: https://www.facebook.com/events/545537178943582/