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7th Grade Inside Earth Chapter 1 Sections 3-5

continental drift the continents slow movement over Earth's surface
fossil any trace of an ancient organism preserved in rock
sonar a device that bounces sound waves off underwater objects and records the echoes of the sound waves
deep-ocean trenches underwater canyons
subduction proces by which ocean floor sinks beneath a deep-ocean trench and back into the mantle
plates the separate sections of the lithosphere
scientific theory well tested concept that explains a wide range of observations
plate tectonics pieces of Earths's lithosphere are in slow, constant motion, driven by convection currents in the mantle
faults breaks in Earth's crust where rocks have slipped past each other
divergent boundary place where two plates move apart
rift valley deep valley formed along the divergent boundary
convergent boundary place where two plates come together
transform boundary place where two plates slip past each other moving in opposite directions
Created by: Karen Copanic