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LessonsCatch the Flaw

Lesson 17 · Science · Changes of state

Step 1 of 4

Find the wrong step

A sunny puddle shrinking inside its chalk outline
Your lessonChanges of stateWarm-up

The Vanishing Puddle

A shallow puddle is marked in chalk at noon. By late afternoon, the ground inside the mark is dry.

Weather
Warm and sunny
Observation
No stream carried the water away

Your question

What most likely happened to the water?

Lumi’s answer: “Sunlight destroyed the water.”

1

Step 1 of 4

Find the wrong step

Find where the reasoning first breaks

Start with Step 1 and move downward. Choose the first line that stops making sense.

Later lines may be wrong too. Pick the first mistake.

Lumi’s work

These lines form one solution. Read them from top to bottom.

  1. 1

    The liquid water is no longer visible on the ground.

  2. 2

    Warm sunlight gives water molecules more energy.

  3. 3

    Liquid water can become invisible water vapour in the air.

  4. 4

    Because the puddle is invisible, the water was destroyed.