WONDER #403: Why Do Sidewalks Have Lines?
Question 1 of 3
The technical term for sidewalk lines is what?
- contraction joints
- concrete grooves
- pavement depressions
- cement cracks
Question 2 of 3
What chemical process causes cement, water, crushed rock, and sand to bond together and harden to form concrete?
Question 3 of 3
Which of the following is something builders use to place contraction joints in fresh concrete?
- special grooving tools
- all of the above
Check your answers online at https://www.wonderopolis.org/wonder/why-do-sidewalks-have-lines.