Page 1
A small model volcano can suddenly foam and bubble, which makes many children laugh in surprise.
一个小小的火山模型突然冒泡、喷出泡沫时，常常会让孩子惊讶又开心。正文预览
Page 2
The bubbling does not happen because there is real lava inside. It happens because of a chemical reaction.
它之所以会冒泡，并不是因为里面真的有岩浆，而是因为发生了化学反应。
Page 3
Many volcano experiments use baking soda and an acid such as vinegar.
很多火山实验都会用到小苏打，再配上一种酸性液体，比如醋。
Page 4
When those materials meet, they react and make a gas called carbon dioxide.
当这两种材料碰到一起时，就会发生反应，并产生一种叫二氧化碳的气体。
Page 5
The carbon dioxide gas formed by the reaction pushes upward through the liquid, and that rising gas is what creates all the bubbling.
化学反应产生的二氧化碳气体会往液体上方冲，所以我们看到一连串泡泡冒出来，本质上就是这些气体在往上顶。
