Read the passage below.
A Kitchen Volcano
The Smith family is doing a simple science experiment in their kitchen today. Tommy and his father want to make a small volcano. They use two chemicals from the kitchen: baking soda and vinegar. Baking soda is a base, and vinegar is an acid. When Tommy mixes them in a plastic cup, they create a lot of bubbles and a special gas. His mother takes a picture of the happy family.
Where is the Smith family doing the experiment?
What do Tommy and his father want to make?
A Cool 3D Printer Nina is a smart student. She likes engineering. Today, Nina uses a 3D printer in the computer lab. She wants to make a toy car. First, Nina draws the car on her computer. Then, she sends the design to the 3D printer. The printer uses hot red plastic to build the car. It builds the toy slowly from bottom to top. Nina smiles at her new toy. Why did the author write this text?
What does the word "builds" mean in this text?
