Why the House Pops at Night: teacher key

Ghosts, grade 5 edition, written for 5th grade. A pop in the wall, a creak in the hall, a sound too low to hear. Look for what made each one.

Read the book. Print this page for the key.

Questions and answers

What can make a wood floor creak more in winter?
- Warm air from a duct
- Dry air that makes the boards shrink (answer)
- A hidden actor
What is pareidolia?
- Seeing faces in things that have no faces (answer)
- A pop made by a pipe
- A shadow with a colored ring
What did sharper photos show about the face on Mars?
- It is a shadow on a cloud
- It is a reflection in glass
- It is just a hill (answer)
What is infrasound?
- A draft through a window
- Sound with a pitch below 20 hertz (answer)
- A shadow on fog
Why might a person see a face in a cloud?
- Their brain is very good at spotting faces (answer)
- Clouds are warm
- Pipes are popping