You should do what mothers have done for ages, help him make a volcano. This simple project just involves shaping a volcano out of clay and leaving the hole. When ready fill the hole with dry ice and you have an exploding volcano. You can also use vinegar
There are lots of ideas for a 4th grade science project. One example is studying the solar system, learning about each planet that orbits Earth and the sun.
112
Eat meat
never
density of a gas
I certainly hope not; 4th graders are capable of doing something vaguely resembling actual science, not messing about with motors and light bulbs.
i have him for my science project in 6th grade.
A mousetrap car
No
MAYBE................
Yes
A clay volcano