Volcano Diagram Generator Volcano
Create clear, labeled volcano diagrams in seconds. Show the magma chamber, conduit, vent, crater, and lava flow, or draw a shield, composite, or cinder cone volcano. Free for teachers, students, and researchers.
Volcano Diagram Generator
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Volcano Diagram Examples
Browse volcano diagrams made with Figviz, or generate your own above
Labeled Volcano Diagram
A fully labeled cutaway showing every major part of a volcano, from the deep magma chamber up through the conduit and vent to the erupting ash cloud.
Blank Volcano Worksheet
A blank worksheet version with empty label boxes and leader lines, ready for students to identify each part of the volcano on their own.
Volcano for Kids
A simplified volcano diagram for kids, with bright colors and large friendly labels for the magma, lava, vent, and ash cloud.
Shield Volcano Diagram
A cross-section of a shield volcano, showing its broad low dome built from thin runny lava flows spreading far from the vent.
Composite Volcano Diagram
A cross-section of a composite volcano, or stratovolcano, showing its tall steep cone built from alternating layers of ash and hardened lava.
Cinder Cone Volcano Diagram
A cross-section of a cinder cone volcano, showing its small steep cone of loose cinders and a wide bowl-shaped crater at the top.
What a volcano diagram shows and its labeled parts
A volcano diagram is a cutaway cross-section that slices through a volcano so you can see both its outside shape and the hidden plumbing inside. The parts start far underground and work their way up. The magma chamber is the large reservoir of molten rock deep below the surface. From it, a conduit or pipe carries magma upward through the cone, sometimes branching so the volcano has a main vent and one or more secondary vents on its flanks. Near the top the conduit widens into the throat and opens at the crater, the bowl-shaped opening at the summit. When the volcano erupts, molten rock reaches the surface as lava and pours downhill as a lava flow, while an ash cloud and towering eruption column rise into the sky. Slice the cone open and you see layers of ash and rock, the built-up strata from past eruptions, sometimes cut by a sill (a horizontal sheet of hardened magma) or a dike (a vertical one). A diagram generator turns a short description into a clean, labeled cross-section, so you can skip the drawing and go straight to teaching.
The three types of volcano
How a volcano erupts
An eruption begins deep in the magma chamber, where molten rock collects and pressure builds. Because magma is lighter than the solid rock around it, it pushes upward through the conduit toward the surface. Dissolved gases inside the magma expand as it rises, much like the bubbles in a shaken soda, and that expanding gas drives the eruption. When the magma reaches the vent it becomes lava, and depending on how thick and gas-rich it is, the volcano may ooze gentle lava flows or blast an ash cloud and eruption column high into the air. Falling ash and cooled lava settle onto the cone as fresh layers of ash and rock, which is how the volcano slowly grows taller with each eruption. Showing this sequence on a labeled diagram helps students connect the underground magma chamber with the visible eruption at the surface.
How to make a volcano diagram
Classroom uses for earth science
Frequently asked questions
Related science tools
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