When continents drift together to form the supercontinent
Pangea
When continents slowly move over earth's surface
Continental Drift
Any trace of an ancient organism that has been preserved in rock
Fossil
Is a device that bounces sound waves off underwater objects and then records the echoes of these sound waves
Sonar
An undersea mountain chain where new ocean floor is produced, a divergent boundary
Mid Ocean Trench
When a process continually adds new material to the ocean floor
Sea floor spreading
Where the ocean floor plunges into deep underwater canyons
Deep ocean trench
The process by which ocean floor sinks beneath a deep-ocean trench and back into the mantle
Subduction
Where the lithosphere is broken into separate sections
Plates
A well-tested concept that explains a wide range of observations
Scientific Theory
States that pieces of earth's lithosphere are in a slow, constant motion, driven by convection currents in the mantle
Plate tectonics
It breaks into the earth's crust where rocks have slipped past each other to form along these boundaries
Faults
The place where two plates move apart, or diverge
Divergent Boundary
When a deep valley forms along the divergent boundary
Rift valley
The place where two plates come together, or converge
Convergent boundary
Is a place where two plates slip past each other, moving in opposite directions
Transform boundary
Pulls on the crust, stretching rock so that it becomes thinner in the middle
Tension
When a stress force squeezes rock until it folds or breaks
Compression
Stress that pushes a mass of rock in two opposite directions
Shearing
A force that acts on rock to change its shape or volume
Stress

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