Plate Tectonics Word Scramble

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Term	Definition
the correct order of the four major layers of the Earth, from the innermost to outermost	inner core, outer core, mantle, crust
The inner core is thought to consist primarily of:	iron.
statements about the study of the interior of the Earth	-The velocity of seismic waves varies with the density of the material. -S-waves cannot pass through the liquid outer core. -Data from seismic waves can be used to produce three-dimensional tomographs.
Oceanic crustal rock is best described as:	high in magnesium, iron, and calcium
statements about the lithosphere	-Seismic waves travel more slowly through the aesthenosphere than the lithosphere. -The Moho is the boundary between the crust and the upper mantle. -The lithosphere is less dense than the aethenosphere
The principle explaining the variable bouyancy of crustal material is	isostasy
early theorys about the "fit" of the continents across the Atlantic Ocean	-an unexplained cataclysmic event -subsidence theory of separation -continental drift
palaeogeographic relationships	-Gondwanaland, southern continents -Laurasia, northern continents -Pangaea, super continent
describe mid-ocean rises	-gently sloped compared to mid-ocean ridges -narrow zones of volcanic activity -highest elevation along central axis
cited as evidence of plate motion	-earthquakes landward of subduction zones -variability of heat flow through the ocean crust -mirror images of polarity reversals on each side of mid-ocean ridges
The theory of plate motion has been tested by	-temperature probes on the ocean floor -radiometric dating of seafloor rocks -recording the magnetic polarity of minerals in the crust
Of the following statements about the Earth's plates, which is correct?	New lithosphere is formed at divergent plate boundaries.
Rifting is closely associated with all but which of the following features or processes?	A) divergent zones B) grabens C) mid-ocean ridges This is the correct answer. D) subduction
Which of the following features is not associated with subduction?	This is the correct answer. A) basaltic volcanism and rifting B) andesitic volcanism C) crumpled and fractured continental rocks D) volcanic island arc chains
Passive continental margins are characterized by:	wide, seismically quiet coastal zones
statements about hot spots	A) As oceanic crust cools, it subsides. B) The youngest peak in a chain of seamounts is over the hot spot. C) Guyots are islands that have subsided beneath the surface.
describe the history of the continents.	-Pangaea broke apart about 200 million years ago. -The Walvis Ridge is a chain of seamounts connecting the Mid-Atlantic ridge with Africa. -Through wandering, plates may show evidence of climates related to previous locales.
Remnants of small crustal fragments that are accreted to larger crusts are termed:	A) cratons. B) cretins. This is the correct answer. C) terranes. D) vents.
describe hydrothermal vents?	-Hydrothermal vent activity is known to occur at seafloor spreading centers. -Vents occur over some of the thickest portions of oceanic crust. -Minerals may precipitate rapidly out of super heated plumes of water.
Which of the following statements accurately describes vent communities?	Vent communities rely on bacteria that thrive on minerals in the hydrothermal plumes.
a line of indirect evidence that leads us to believe that the Earth has a layered structure?	-The density of the Earth is greater than the density of the surface rocks on Earth. -The Earth's magnetic field indicates that the center must be composed of magnetic material. -The composition of some meteorites, which are believed to be of the same m
What does the Moho represent?	A chemical boundary between the crust and mantle.
Where is measured heat flow greatest along the oceanic crust?	In the center of ocean basins nearest the mid ocean ridges
true about earthquakes	-They are commonly associated with subduction zones. -Earthquakes with a deeper focus tend to occur farther inland. -They are used to characterize the density and composition of the interior of the Earth.
Which is an example of an active continental rift?	East Africa
Which type of crust will subduct most rapidly?	Old oceanic crust
The Philippines are the result of what type of plate boundary?	Oceanic-Oceanic Convergent

Created by: kwhite6448