Lava Lamp

Reese and Grandma Cipra did a science experiment today, and created something that looked like a lava lamp. 

You fill a bottle 2/3 full of oil (we used vegetable oil), then add 1/3 bottle of water, plus we added a little food coloring.  Of course the water sank to the bottom, and oil rose to the top, which was a fun science experiment in and of itself.  But then Reese dropped in an Alka Seltzer tablet which created colorful fizzing bubbles.  So neat!  Reese wanted to do it over and over again, and used up all 6 Alka Seltzer tables Grandma brought.