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Volcanoes: What Happens Underground Before It Blows

Students build pressure beneath a volcano and watch magma rise — discovering why volcanoes erupt, where they form, and how people stay safe.

Grades 3–5Upper Elementary45 minutes1 class period5E ModelInquiry-based4 StandardsNGSS + CCSS
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Lesson at a Glance

Everything you need before the bell rings

Learning Objectives

Students will be able to…

  • ✓Identify the parts of a volcano: magma chamber, vent, crater.
  • ✓Explain that pressure from rising magma causes eruptions.
  • ✓Tell the difference between magma and lava.
  • ✓Describe where volcanoes form and how people reduce the hazard.
Essential Question

A volcano can sit quietly for a hundred years, then erupt in minutes. What’s building up underground — and what finally sets it off?

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5E Phases
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Vocabulary Terms
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Standards Aligned
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Interactive Task
Explore · Interactive Model

Build the Pressure

Project this and let students raise the pressure beneath the volcano. Have them record what the magma does at each level — and what finally happens.

🌋 Raise the pressure — make it eruptTry it
Magma pressure: LowDormant

The Lesson · 5E Model

45 minutes, five moves

Tap any phase to open the teacher moves and student actions.

1

Engage — The Shaken Bottle

5 min

What do a shaken soda and a volcano have in common?

👩‍🏫 Teacher Moves

  • Show (or describe) a shaken, sealed soda bottle.
  • Ask: “What’s building up? What happens when it opens?”
  • Connect trapped pressure to a volcano.

🎒 Student Actions

  • Predict what happens when the bottle opens.
  • Compare the fizz to an eruption.
  • Record a first idea in their notebook.
2

Explore — Build the Pressure

12 min

Students raise the pressure and watch magma rise.

👩‍🏫 Teacher Moves

  • Send groups to the Build the Pressure model above.
  • Ask them to record what magma does at each level.
  • Prompt: “What finally makes it erupt?”

🎒 Student Actions

  • Raise pressure from low to critical.
  • Record when magma rises and when it erupts.
  • Notice magma becomes lava at the surface.
3

Explain — Parts & Why It Erupts

12 min

Name the parts and the cause.

👩‍🏫 Teacher Moves

  • Label magma chamber, vent, crater.
  • Explain eruptions = pressure pushing magma up.
  • Distinguish magma (underground) from lava (surface).

🎒 Student Actions

  • Label a volcano diagram.
  • Explain why pressure causes eruptions.
  • Use magma and lava correctly in a sentence.
4

Elaborate — Where & How Safe

11 min

Why do volcanoes cluster in certain places?

👩‍🏫 Teacher Moves

  • Introduce the “Ring of Fire” simply (map).
  • Discuss hazards: ash, lava, gases.
  • Explain how scientists monitor and warn people.

🎒 Student Actions

  • Locate volcano zones on a map.
  • List volcano hazards.
  • Suggest how communities stay safe.
5

Evaluate — Exit Ticket

5 min

Three quick checks on parts, cause, and terms.

👩‍🏫 Teacher Moves

  • Hand out the exit ticket below.
  • Look for pressure cause + magma/lava.
  • Collect as formative data.

🎒 Student Actions

  • Name a volcano part.
  • Explain why volcanoes erupt.
  • Tell magma from lava.
Standards Alignment

Built to the standards you report on

Aligned to Next Generation Science Standards and Common Core literacy. State-standard crosswalks available on request.

NGSS
4-ESS2-2

Analyze and interpret data from maps to describe patterns of Earth’s features.

NGSS
4-ESS3-2

Generate and compare solutions to reduce the impacts of natural Earth processes on humans.

NGSS
4-ESS1-1

Identify evidence from patterns in rock formations and fossils to support an explanation for changes in a landscape over time.

CCSS
RI.4.3

Explain events, procedures, or concepts in a scientific text based on specific information.

Differentiation

One lesson, every learner

Multilingual Learners

ELL / EMERGING READERS
  • Labeled volcano cross-section with picture words.
  • Sentence frame: “Magma is ___; lava is ___.”
  • Use the soda-bottle demo as a shared anchor.

Support & Access

IEP / 504
  • Provide a partially-labeled volcano diagram.
  • Focus on magma vs. lava as the key idea.
  • Allow drawing the eruption instead of writing.

Stretch & Extend

GIFTED / EARLY FINISHERS
  • Research a famous volcano (Vesuvius, Kilauea).
  • Investigate the three main volcano shapes.
  • Explain how tectonic plates create the Ring of Fire.
Materials

What to gather

  • 📽️Projector / board
  • 📓Science notebooks
  • 💻The Build-the-Pressure model
  • 🧪Baking soda + vinegar (optional demo)
  • ✏️Colored pencils
  • 🎫Exit-ticket slips
Vocabulary

Key terms — hover for a quick definition

volcanoan opening where magma reaches the surfacemagmamelted rock undergroundlavamelted rock at the surfaceventthe pipe magma travels upcraterthe bowl-shaped opening at the topmagma chamberthe pool of magma beloweruptionwhen magma bursts outpressurea force pushing outward
Evaluate

Exit Ticket

Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.

QUESTION 1
Name two parts of a volcano.
Sample: the magma chamber (pool of magma below) and the vent (the pipe magma rises through). Also acceptable: crater.
QUESTION 2
What causes a volcano to erupt?
Pressure from rising magma builds up beneath the volcano until it forces the magma up through the vent and out the crater.
QUESTION 3
What is the difference between magma and lava?
They are the same melted rock — it is called magma when it is underground and lava once it reaches the surface.

Going deeper? Erupt a model volcano.

Build the classic baking-soda-and-vinegar volcano and have students observe the “eruption,” then diagram the real parts it represents. A printable diagram sheet is in the Science library.

Study · Flashcards

Study the key terms

Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.

🃏 VolcanoesFlip
Card 1
Term
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Meaning
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Practice · Quiz

Check your understanding

A quick self-check with instant feedback, drawn from this lesson’s key terms.

📝 VolcanoesQuiz
Score: 0
1 / 6
Question 1
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Practice · Worksheet

Printable worksheet

A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.

🖨️ VolcanoesPrint
Name: ________________________
Date: ____________

Part A · Write the word that matches each meaning

Word bank: crater, eruption, lava, magma, magma chamber, pressure, vent, volcano
  1. when magma bursts out
  2. an opening where magma reaches the surface
  3. the bowl-shaped opening at the top
  4. the pipe magma travels up
  5. the pool of magma below
  6. a force pushing outward
  7. melted rock underground
  8. melted rock at the surface

Part B · Show what you learned

  1. Name two parts of a volcano.
  2. What causes a volcano to erupt?
  3. What is the difference between magma and lava?
Answer key — Part A: 1) eruption · 2) volcano · 3) crater · 4) vent · 5) magma chamber · 6) pressure · 7) magma · 8) lava
Part B: 1) Sample: the magma chamber (pool of magma below) and the vent (the pipe magma rises through). Also acceptable: crater. 2) Pressure from rising magma builds up beneath the volcano until it forces the magma up through the vent and out the crater. 3) They are the same melted rock — it is called magma when it is underground and lava once it reaches the surface.