Earth’s outer shell is broken into huge pieces called plates. They move slowly. At their edges, plates can pull apart, push together or slide past each other. These movements help change Earth’s surface.
Earth and geology · Discover & try
What happens where tectonic plates meet?
Reading level 1 of 5 · EarlyChange
Word help
Tectonic plate
A moving piece of Earth’s rigid outer shell, including crust and uppermost mantle.
Subduction
One tectonic plate moving down beneath another.
Transform boundary
A boundary where plates move mainly sideways past one another.
Watch · Try · Explain
See how it works
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Idealised boundary cross-sections. Arrows show relative motion, not actual speed or a forecast of earthquakes.
What to look for
- Follow the arrows showing relative movement.
- Compare subduction with continental collision.
- Notice that a boundary is not necessarily a coastline.
Explain what you noticed
Which movement describes a transform boundary?
Keep this idea: The relative motion of neighbouring plates helps explain what happens at their boundary.
Follow the sources
- U.S. Geological Survey — Understanding plate motions
- NOAA Ocean Exploration — What are the different types of plate tectonic boundaries?
Source material checked 2026-10-28. Explanations and activities by Nepedia. Agency source links do not imply endorsement.
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