Mountain Building Simulator
Compress a crustal block with adjustable plate velocity, rock strength and erosion, and watch a mountain range grow in real time cross-section, surface and stress views.
How to use: adjust compression, plate velocity, rock strength, crust thickness and erosion rate, then watch the range grow over geologic time. Switch views (cross-section / surface / stress) and try the Challenge tab for guided goals.
Challenge 1: build a Himalaya-scale range
Push the peak height above 7000 m by tuning compression, velocity, strength and thickness.
Challenge 2: reach equilibrium
Real orogens stop growing once uplift roughly equals erosion. Tune the sliders so the net height change (uplift − erosion) stays within ±0.5 m/Myr of zero while the peak is above 1000 m.
About the Mountain Building Simulator
Free mountain building simulator. Compress a crustal block with adjustable plate velocity, rock strength and erosion, and watch a mountain range grow in real time cross-section, surface and stress views. Drag, change the sliders and see the result live. No sign-up, works on phone and computer. Built for geology, the mountain building simulator runs instantly in your browser: change a setting or drag an object and the result updates at once, so you learn by trying things out rather than only reading about them.
Compress a crustal block with adjustable plate velocity, rock strength and erosion, and watch a mountain range grow in real time cross-section, surface and stress views. Use it to explore geology ideas at your own pace, then check what you found against the key ideas further down this page.
How to use the Mountain Building Simulator
- Use the controls to change Compression force, Plate velocity, Rock strength, Crust thickness, Erosion rate, and more. The simulation reacts instantly.
- Press "Reset mountain", "Reset to defaults", "📄 Lab Report" to start, reset or change what is happening.
- Where you see a glowing handle, object, weight or atom, drag it with your mouse or finger. Everything responds in real time.
- Watch the readouts and graphs update as you experiment, and compare what you see with the key ideas below.
Things to try
- Push compression to maximum and watch the mountain rise quickly.
- Raise erosion rate and see the height plateau lower.
- Switch to the stress view and see where compressive stress concentrates.
- Compare a strong versus weak rock at the same compression force.
Key ideas you can learn
- Uplift rate grows with compression force and plate velocity, and falls with greater rock strength.
- Erosion accelerates as a mountain gets taller because there is more relief and gravity-driven mass wasting.
- Mountains tend toward an equilibrium height where uplift equals erosion.
- Thicker crust can support taller mountains before buckling.
Where this is used in the real world
This uplift-versus-erosion balance is exactly how geologists explain why the Appalachians (old, eroded) are lower than the Himalaya (young, still rising faster than they erode).
Who is this simulation for?
Students, teachers and curious learners of all ages.
For teachers: project it on the board, let students predict what will happen, then run it together. For students: change one thing at a time and write down what changes.
Frequently asked questions
Why don't mountains grow forever?
As they get taller, erosion accelerates until it matches the uplift rate, creating a rough steady-state height.
What is crustal thickening?
Compression at a plate boundary folds and stacks crustal rock, increasing both its thickness and its elevation.
Is the Mountain Building Simulator free to use?
Yes. It is completely free, with no signup, no download and no ads inside the simulation. It runs in your web browser.
Does the Mountain Building Simulator work on a phone or tablet?
Yes. It uses touch as well as the mouse, so you can drag objects with your finger. A larger screen makes the controls easier to see.