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Inside Earth Book Vocabulary
Chapter 1/Sections 4&5
13
Science
8th Grade
06/19/2005

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Cards

Term
mid-ocean ridge
Definition
the undersea mountain chain where new ocean floor is produced; a divergent plate boundary
Term
sonar
Definition
a device that determines the distance of an object under water by recording echoes of sound waves
Term
sea-floor spreading
Definition
the process by which molten material adds new oceanic crust to the ocean floor
Term
deep-ocean trench
Definition
a deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle
Term
subduction
Definition
the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
Term
plate
Definition
a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust
Term
scientific theory
Definition
a well-tested concept that explains a wide range of observations
Term
plate tectonics
Definition
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
Term
fault
Definition
a break in Earth's crust where slabs of rock slip past each other
Term
transform boundary
Definition
a plate boundary where two plates move past each other in opposite directions
Term
divergent boundary
Definition
a plate boundary where two plates move away from each other
Term
rift valley
Definition
a deep valley that forms where two plates move apart
Term
convergent boundary
Definition
a plate boundary where two plates move toward each other
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