Turning Toward the Light: teacher key

Day and Night, grade 4 edition, written for 4th grade. Earth's spin brings day and night, and its tilt brings the seasons. Planets and living things keep their own clocks.

Read the book. Print this page for the key.

Questions and answers

1. What causes day and night?
   • Earth's spin (answer)
   • Earth's tilt
   • The Moon
2. What causes the seasons?
   • The Sun moving
   • Owls
   • Earth's tilt as it goes around the Sun (answer)
3. Where is the human body's master clock?
   • In the heart
   • In the brain (answer)
   • In the eyes
4. Why does the Sun seem to rise in the east?
   • Clouds push it
   • The Sun walks east
   • The Earth turns toward the east (answer)
5. What does circadian mean in circadian rhythm?
   • Following a roughly 24-hour cycle (answer)
   • Found only in owls
   • Very far away

Words

• circadian: 24-hour body clock
• diurnal: active by day
• twilight: evening glow
• axis: spin line