The Comet Dust Puzzle's Hidden Echo — Questions and answers

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What did geologists find in a rocky canyon near Gubbio, Italy?

Choices

  1. A thick layer of white rock
  2. A pinkish layer of rock
  3. A single, thin, dark line of clay ✓
  4. An ancient storybook

Answer: A single, thin, dark line of clay

From page 3

What did Luis Walter Alvarez see the clay layer as?

Choices

  1. A geological puzzle
  2. A measurement problem ✓
  3. A beautiful pattern
  4. An easy question

Answer: A measurement problem

From page 4

What did Ezra realize was the answer to her question about space dust?

Choices

  1. It was still floating in space.
  2. It had become part of the stars.
  3. It was hidden in the thin layer of clay. ✓
  4. It disappeared completely.

Answer: It was hidden in the thin layer of clay.

From page 8