Some of us decided to 

make volcanoes with the lego.

 We filled the volcanoes with

baking soda and then poured vinegar into the volcano...we shared our predictions with our friends about what we thought would happen when they mixed together.

 We saw a chemical reaction...

the baking soda and vinegar mixed together...

and created a gas. 

We saw the vinegar go all bubbly and pour out of the volcano.