Rocks That Remember: teacher key

Fossils, grade 3 edition, written for 3rd grade. Fossils are what is left of plants and animals from long ago. See how they form, what they can be and what they show.

Read the book. Print this page for the key.

Questions and answers

1. What can hold tiny animals such as ants and flies?
   • Amber (answer)
   • Silt
   • Skin prints
2. How long can making a fossil take?
   • A few days
   • Often thousands to millions of years (answer)
   • One summer
3. What turns buried bones and teeth to stone?
   • Layers of sand
   • Water full of minerals (answer)
   • Tree sap
4. Two dead animals lie on the ground. Mud covers one at once. The other is left in the open. Which is more likely to become a fossil?
   • The one left in the open
   • Both are the same
   • The one covered at once (answer)
5. What does petrified mean?
   • Turned to stone (answer)
   • Very old
   • Full of sap

Words

• silt: fine mud
• minerals: rock bits
• petrified: turned to stone