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9 Cards in this Set

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The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
Pangaea
continents that slowly moved over
Earth's surface is
Continental drift
Any trace of an ancient organism that has been preserved in a rock
Fossil
The longest chain of mountains in the world
Mid-ocean ridge
A process that continually adds new material to the ocean floor
Sea-floor spreading
A deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle
Deep-ocean trenches
A section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continenetal and oceanic crust
Plate
a well tested concept that explains a wide range of observations
Scientific theory
geological theory that states that pieces of Earth's lithosphere are in a constant,slow motion, driven by convection currents in the mantle
plate tectonics