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Plate Tectonic

Horizontales
What does a divergent boundary form
Where ocean plates slide under another plate
The idea of moving continents
Part of the upper mantle
Who used a sonar to map the ocean floor
Plates move apart
Verticales
Where is oldest rock found
Who created the theory of continental drift
What do convection currents cause
Plates move together
Where is the youngest rock found
Where plates move away from each other