Science · Stage 2
Challenge: Mystery Material
Check every clue — hard or soft, clear or not, magnet or not, float or sink — until one material fits them all!
✦ Science📘 Stage 2 · S2⏱ ~9 min🧒 Ages 6–7★ Free to start
work out a mystery material by checking all its clues together until only one material fits every clue.
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Kavi's Mystery Material Lab
Kavi hides a mystery thing inside a box 📦 and gives three clues: "It is light, and it floats on water. Is it wood, or a rock?" A rock is heavy and sinks — so it can't be the rock! A master checks every clue together until only one material is left. "Open the box — it's wood! 🪵" hoots Kavi.
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What your child will learn
1The four clue questionsTo find a mystery material, a detective asks four questions. Tap each clue question to learn it.
2Clue one: float or sink?Start with one clue to narrow it down. Drop each thing in water — tap the right box.
3One clue vs. all the cluesWhy isn't one clue enough? Tap each card to see.
4Be a mystery-material master!Read every clue, cross out what does not fit, then pick the mystery material. Check your answer!
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A peek inside
Clues: it is light and it floats. Mystery: 🪵 wood or 🪨 stone?
A stone is heavy and sinks — it is out. Wood is light and floats.
Try this at home: A mystery thing is light and floats. Could it be a steel nail? Why or why not?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Science · Stage 2 · S2 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.