Built to Stand: teacher key

How Buildings Stand Up, grade 2 edition, written for 2nd grade. Steel, concrete, wind and a safe elevator: what keeps tall buildings standing, and how they got so tall.

Read the book. Print this page for the key.

Questions and answers

1. What is a tall building's frame like?
   • A skeleton (answer)
   • A sandwich
   • A balloon
2. What do builders put inside concrete?
   • Sand
   • Steel bars (answer)
   • Grass
3. How much does the pendulum in Taipei 101 weigh?
   • 60 tonnes
   • 6 tonnes
   • 660 tonnes (answer)
4. What did Elisha Otis show?
   • A safe elevator (answer)
   • A tall wind
   • A wood frame
5. Why do builders add steel bars to concrete?
   • Concrete is weak when pulled (answer)
   • Concrete is too light
   • Concrete is too red

Words

• skeleton: body's frame
• concrete: hard gray stuff
• pendulum: swinging weight
• foundation: building's base