How Sinkholes Form

Lab Brief #2

🎯 Your mission

Predict it first. Then prove yourself right (or wrong).

⚡ The twist

Nature loves to surprise the careful watcher.

What you'll learn

Sinkholes form when underground limestone dissolves, leaving a cavity that collapses. They are common in areas with karst topography where water slowly dissolves the bedrock.

Key words

water cycle
The way water moves from clouds to rain to rivers and back.

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

rocks
water
plastic tray

⚠️ Safety first

Wash your hands thoroughly afterwards and keep the material away from your face.
Mop up spills straight away so nobody slips, and keep liquids away from sockets.

Step 1 of 4 · Read

Look at the vocabulary words and write a definition for each in your own words.

Step 2 of 4 · Do

Model erosion: tilt a tray of soil and pour water from a cup at the top. Observe how channels form. Try adding plants or rocks to slow the erosion.

Step 3 of 4 · Observe

Use your senses (except taste) to describe what you notice.

Step 4 of 4 · Record

Write a summary of your findings in 3-5 sentences.

Question 1 of 3

How do fossils form?

How sure are you?😐 maybe

Question 2 of 3

What forms when tectonic plates collide?

How sure are you?😐 maybe

Question 3 of 3

What type of rock forms from cooled magma?

How sure are you?😐 maybe

Mind = blown

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

Nice work!

You got 0 of 3 right.

Next: Hot and Cold Deserts All lessons

🎯

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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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How Sinkholes Form

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