One of the most simple, but fun to watch science activities to do at home is to make a lava lamp! Be prepared with plenty of supplies because your kids will want to repeat this over and over.
Fill a clear glass or jar 3/4 full of oil.
Fill the rest with water.Add a couple drops of food coloring.
Then drop in an Alka-Seltzer tabletWait for it…
Watch the colors bubble around. Try mixing different food coloring colors!
This is so simple but definitely fun for kids. Even my older boys still love doing it now and then, or just hanging out to watch when we show the younger cousins.