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Grade 8 Chapter 5

continental drift, sea-floor spreading, plate tectonics

QuestionAnswer
continental drift hypothesis that all of the continents were once joined together in a single landmass and have since drifted to their present locations
Pangaea the name of the supercontinent
fossil any trace of an ancient organism preserved in the rock
Alfred Wegener German meteorologist who hypothesized continental drift.
Harry Hess geologist who theorized sea-floor spreading
mid-ocean ridge long chains of mountains that rise up from the ocean floor
sea-floor spreading the process of new rock to the ocean floor along mid-ocean ridges pushing the older rock toward the continents
deep-ocean trenches a canyon left behind from part of the oceanic crust sinking into the mantle
subduction older, cooler, more dense ocean floor sinks back into the mantle
convergent boundary two plates come together or collide
divergent boundary two plates spread apart or move away
transform boundary two plates slide past one another
plate tectonics theory that plates are in slow, constant motion, driven by convection currents in the mantle
convection currents of heating/rising, cooling/sinking mantle material caused by heat in the core
rift valley divergent boundary occurring on land leaving a valley
faults breaks in the Earth's crust where rocks have slipped past each other at the boundaries
Created by: KimRoush
 



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