Earthquakes and Volcanoes

Active learning engages students directly with the tangible evidence behind abstract seismic principles. By handling real or simulated seismic data, mapping volcanic landforms, and comparing eruption styles, students anchor their understanding in concrete experience rather than abstract explanation.

• 7th Grade
• Science
• 3 activities
• 25 min–50 min

Learning Objectives

1. Classify seismic waves (P-waves, S-waves) based on their motion and arrival times.
2. Construct an explanation for how plate tectonic movement causes earthquakes and volcanic activity at plate boundaries.
3. Compare and contrast the eruption styles of different volcanoes based on magma composition and viscosity.
4. Analyze seismic data from three stations to triangulate and determine the location of an earthquake epicenter.
5. Evaluate the potential hazards associated with different types of volcanic eruptions, such as ash fall, pyroclastic flows, and lava flows.

Inquiry Circle

⏱ 50 min·Small Groups

Inquiry Circle: Locating an Earthquake Epicenter

Groups receive seismograms showing P-wave and S-wave arrival times from three monitoring stations, plus a scaled map. Students calculate the distance to the epicenter from each station using the P-S wave time difference, then draw circles of the appropriate radius on the map. The intersection of the three circles locates the epicenter. Groups compare their results and discuss sources of error.

Prepare & details

Explain the relationship between plate boundaries and the occurrence of earthquakes and volcanoes.

Facilitation Tip: During Collaborative Investigation, assign each group a unique set of P-wave and S-wave arrival times so every group contributes a different circle to the class’s final epicenter map.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Think-Pair-Share

⏱ 25 min·Pairs

Think-Pair-Share: Eruption Style Prediction

Present data cards for five volcanoes including silica content, plate boundary type, and recent eruption history. Students individually predict whether each eruption would be effusive or explosive and explain their reasoning. Partners compare predictions and construct a shared explanation that links magma composition to eruption style.

Prepare & details

Analyze the different types of seismic waves and their impact.

Facilitation Tip: For Think-Pair-Share, provide short video clips of both effusive and explosive eruptions so students have immediate visual evidence to contrast viscosity and gas content.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Gallery Walk

⏱ 35 min·Small Groups

Gallery Walk: Types of Volcanoes

Post three stations covering shield volcanoes, composite volcanoes (stratovolcanoes), and cinder cones, each with cross-section diagrams, photographs, and data on eruption frequency and intensity. Groups annotate each station with the likely plate setting, example locations in the US, and the specific hazards each type poses to nearby communities.

Prepare & details

Predict the potential hazards associated with different types of volcanic eruptions.

Facilitation Tip: In Gallery Walk, post one volcano image and description at each station so students move with purpose and record evidence directly on their handouts.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Teaching This Topic

Teachers should use a progression from concrete to abstract: start with hands-on seismic data to locate epicenters, then move to short eruptive videos to classify volcanic styles, and finally connect both to plate boundary maps. Avoid starting with theory; let students discover patterns in data first. Research shows that when students manually calculate distances and plot circles, they retain the relationship between wave speeds and epicenter location more reliably than when they only view animations.

What to Expect

Successful learning looks like students using seismic wave travel times to pinpoint an epicenter with a map and compass, predicting volcanic eruption styles based on magma properties, and clearly distinguishing shield, composite, and cinder cone volcanoes in gallery displays.

Watch Out for These Misconceptions

Common Misconception

During Collaborative Investigation, watch for students who treat earthquake timing as completely unpredictable.

What to Teach Instead

Use the group’s calculated distances and the intersecting circles on their map to point out how the location is determined precisely, even though timing remains uncertain; emphasize that location is a product of plate boundaries, not randomness.

Common Misconception

During Think-Pair-Share, watch for students who assume all volcanic eruptions produce similar lava flows.

What to Teach Instead

Direct students to compare the short video clips of Hawaiian lava fountains versus Mount St. Helens’ explosive blast, and ask them to note the differences in color, speed, and explosiveness before predicting eruption styles based on magma properties.

Assessment Ideas

Quick Check

After Collaborative Investigation, provide each student with a different set of P-wave and S-wave arrival times and ask them to calculate the distance to the epicenter and explain how three such distances locate a unique point.

Discussion Prompt

During Think-Pair-Share, circulate and listen for students who connect magma viscosity and gas content to observed eruption styles, using examples from the provided videos to justify their reasoning.

Exit Ticket

After Gallery Walk, collect students’ annotated station sheets to check that they correctly labeled volcano types, described eruption styles, and connected each type to its plate boundary context.

Extensions & Scaffolding

• Challenge students to design a new volcanic island chain by selecting a plate boundary type and predicting both eruption style and resulting topography.
• For students who struggle with time-distance graphs, provide a pre-labeled graph with one P-wave and one S-wave line already plotted and ask them to find the second S-wave point.
• Deeper exploration: Have students research how earthquake early warning systems use P-wave and S-wave differences to send alerts before shaking arrives, then present their findings to the class.

Key Vocabulary

Plate Boundary	The region where two tectonic plates meet, characterized by geological activity like earthquakes and volcanoes.
Seismic Waves	Vibrations that travel through Earth's layers, produced by earthquakes or other disturbances.
Epicenter	The point on Earth's surface directly above the focus, or origin, of an earthquake.
Magma Viscosity	A measure of a magma's resistance to flow, which influences the explosivity of volcanic eruptions.
Subduction Zone	An area where one tectonic plate slides beneath another, often leading to volcanic activity and deep earthquakes.