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Plate Boundary Types & Examples Cheat Sheet
A printable reference covering divergent, convergent, and transform plate boundaries, key features, hazards, and real-world examples for grades 6-11.
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Plate boundaries are the places where Earth’s tectonic plates meet, move apart, collide, or slide past one another. This cheat sheet helps students compare the three main boundary types and connect each type to landforms, earthquakes, volcanoes, and real-world examples. It is useful for reviewing diagrams, identifying boundary clues, and explaining why geologic hazards happen in certain regions. Divergent boundaries occur where plates move apart and new crust forms, often at mid-ocean ridges or rift valleys. Convergent boundaries occur where plates move toward each other, causing subduction, mountain building, volcanoes, trenches, and strong earthquakes. Transform boundaries occur where plates slide horizontally past each other, producing frequent shallow earthquakes but usually not volcanoes. The most important skill is matching plate motion to the features and hazards created at each boundary.
Key Facts
- At a divergent boundary, plates move away from each other, magma rises, and new crust forms.
- A mid-ocean ridge is a long underwater mountain chain formed by seafloor spreading at a divergent boundary.
- At a convergent boundary, plates move toward each other, and the denser plate may subduct beneath the less dense plate.
- Oceanic-oceanic convergence can form deep-ocean trenches and volcanic island arcs, such as the Mariana Islands.
- Oceanic-continental convergence can form trenches and continental volcanoes, such as the Andes Mountains.
- Continental-continental convergence usually forms tall folded mountains, such as the Himalayas, because neither plate easily subducts.
- At a transform boundary, plates slide past each other horizontally, producing shallow earthquakes along faults such as the San Andreas Fault.
- Plate motion is commonly measured in centimeters per year, and distance moved = rate x time.
Vocabulary
- Tectonic plate
- A large, moving piece of Earth’s lithosphere that includes crust and the uppermost mantle.
- Divergent boundary
- A plate boundary where two plates move away from each other and new crust is created.
- Convergent boundary
- A plate boundary where two plates move toward each other, often causing subduction, mountains, trenches, or volcanoes.
- Transform boundary
- A plate boundary where two plates slide horizontally past each other along a fault.
- Subduction
- The process in which one tectonic plate sinks beneath another plate into the mantle.
- Fault
- A break in Earth’s crust where blocks of rock move past each other.
Common Mistakes to Avoid
- Confusing divergent and convergent boundaries is wrong because divergent plates move apart while convergent plates move together.
- Saying all plate boundaries make volcanoes is wrong because transform boundaries usually create earthquakes without forming volcanoes.
- Assuming every convergent boundary has the same result is wrong because oceanic-oceanic, oceanic-continental, and continental-continental collisions create different features.
- Forgetting density during subduction is wrong because the denser oceanic plate usually sinks beneath the less dense plate.
- Labeling the San Andreas Fault as divergent is wrong because it is a transform boundary where plates slide sideways past each other.
Practice Questions
- 1 A plate moves away from a ridge at 3 cm per year. How far does it move in 100 years?
- 2 Two plates converge at a rate of 6 cm per year. How much closer do they become in 50 years?
- 3 A boundary has a deep-ocean trench, frequent earthquakes, and a chain of volcanoes on the edge of a continent. What type of plate boundary is it, and what plate process is happening?
- 4 Why do transform boundaries commonly produce earthquakes but usually not volcanoes?