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Chapter 17

Vocabulary

TermDefinition
continental drift Wegener's hypothesis that Earth's continents were joined as a single lanswass, called Pangaea, that broke apart about 200 mya and slowly moved to their present
Pangaea ancient land mass made up of all the continents that began to break apart apart about 200 mya.
magnetometer device used to map the ocean floor that detects small changes in magnetic ields.
magnetic reversal When Earth's magnetic field changes polarit between normal and revesed.
paleomagnetism study of Earth's magnetic record usin data gathred from ironbearign minerals in rocks that have recored the orientation of Earth's mamgetic field at the time of their formation.
isochron Imaginary line on a map that shows pooints of the same age; formed at the same time.
seafloor spreading the hyothesis that new ocean crust is formed a t mid-ocean ridges and detroyed at deep-sea trencehes, occurs in a cotinious cycle of magma intusion and spreading
tectonic plate huge pieces of earth's cust taht cover its surface and fit togeterat their edges.
divergent boundary place where two of Earth's tectonic plates are moving apart; is associated with colcansim, earthquakes, and high heat flow, and is found primarly on the seafloor.
rift valley long, narrow depression that forms when continental crust begins to separate at a divergent boundary.
convergent boundary place whre two tectonic plates are moving toward each other; is associated with trenches, island arces, and folded mountains.
subduction process by which one tectonic plate slids beneath another tectonic plate.
transform boundary place where two tectoic plates slide horizntally as t ech antother; is characterized by long faults and shallow earthquakes
Ridge Push Tectonic process associated with convection currents in Earth;s mantel taht occurs when the weight of an elevate ridge pushes an oceanic plate toward a subduction zone
Slab pull tectonic process associated with convection currents in Earths mantel that occurs as the weight of the subductioning plate pulls the trailing lithosphere into asubduction zone
Created by: louizatamez
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