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FRACTURED GLOBE ▶
The plates fit together to form the
globe. Some plates are moving apart
at divergent boundaries, but the world
never gets bigger because the fringes
of other plates are being destroyed
at convergent boundaries. The
relative movement of the Pacific,
Cocos, and Caribbean plates
shows how the plate boundaries
are formed.3
Transform boundariesThese formwhere two plates are sliding past
each other. This causes frequent
earthquakes along the fault line,
but few volcanoes.Plates grind and
snap, causingEarthquakes
Land features
displaced by plate
movementPlate boundary
indicated by
fault linePacific plate slides
along transform
boundary of San
Andreas FaultPlates pull apart at
East Pacific Rise, a
divergent boundaryCocos plate pushes
beneath Caribbean plate
at convergent boundaryNorth American
plateSouth
American platePacific plateNazca plateCocos plateCaribbean plate156_157_Tectonics.indd 157 03/01/19 12:10 PM