Layers Tell a Story

Lab Brief #1

🎯 Your mission

Set it up. Test it. Be amazed.

⚡ The twist

Nature loves to surprise the careful watcher.

What you'll learn

Sediment settles in layers, so in undisturbed rock the deepest layer is the oldest. Reading the order of layers and the fossils inside them is how geologists work out the sequence of events without knowing exact dates.

Key words

superposition
The rule that in undisturbed layers, the lowest is the oldest.
strata
The visible layers of sedimentary rock.

Make a hypothesis first

Before you start: write down what you think will happen, and why.

Say your guess out loud — then find out if you were right.

Get ready

🧰 What you need

clear jar
sand
gravel
soil
small objects

Get ready

⚠️ Safety first

Wash hands after handling soil.
Small objects are a choking hazard for young children.

Step 1 of 4 · Read

Think about what you just learned: say what "superposition" and "strata" mean in your own words before you start.

Step 2 of 4 · Do

Build layered strata in a clear jar with sand, gravel and soil, pressing a different small object into each layer. Swap jars with a partner and put their objects in age order.

Step 3 of 4 · Observe

Record what actually happened, including anything that did not match what you expected.

Step 4 of 4 · Record

Write a conclusion that answers the question this lesson opened with, and state your uncertainty.

Question 1 of 2

In undisturbed rock layers, the oldest layer is:

How sure are you?😐 maybe

Question 2 of 2

Layers of sedimentary rock are called:

How sure are you?😐 maybe

Mind = blown

🔬 The more you look, the more nature shows you.

Nice work!

You got 0 of 2 right.

All lessons

🎯

Next Smart Experiment

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✨ More to explore

🌍 Where you see this in real life: This shows up in your everyday life more than you'd think.

🏆 Stretch challenge (try it this week): Try one experiment in real life this week — even a tiny one.

👨‍👩‍👧 For the dinner table: “What's the most surprising thing you learned today?”

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Layers Tell a Story

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