Ch 11 Question Preview (ID: 3294)


Plate Tectonics. TEACHERS: click here for quick copy question ID numbers.

If Wegener could have explained _____________ his theory of continenetal drift might have been moere widely accepted in his day
a) what forces could move continents
b) nature abhors a vacuum
c) how coal forms
d) what causes the tides

Sonar contributed to information about the ocean bottom by
a) allowing scientists to detect submarines
b)
c)
d) giving scientists a way to map the botom terrain

A ___________ is an underwater mountain range
a) rift valley
b)
c) mid ocean ridge
d) trench

A ______ runs through a mid ocean ridge
a) rift valley
b)
c)
d) trench

According to the theory of sea floor spreading new sea floor _____________
a) emerges from the rift valley
b)
c) emerges from the mid ocean ridge
d) subsides at the trenches

___________ causes the emergence of a new sea floor
a) magma pushing up from asthenosphere
b)
c) basaltic orientation in the trenches
d) polar reversal

Evidence of seafloor spreading includes
a) patterns of sediment layers, radiometric dating of sea floor and midcontinent rocks, magnetic patterns found on the seafloor
b)
c) patterns of sediment layers, radiometric dating of sea floor and midcontinent rocks, tide patterns found on the seafloor
d) mineral patterns consistent with moon rocks, radiometric dating of sea floor and midcontinent rocks, magnetic patterns found

The theory of plate tectonics unites the theroy of seafloor spreading and the theory of continental drift
a) true
b)
c)
d) false

According the the theory of plate tectonics the lithosphere consists of
a) unbroken solid mass that surrounds the molten interior
b)
c) hot spots that float up from the mantle
d) several rigid plates that float of the astehnosphere

Mid ocean ridges, rift valley and trenches are thought to
a) mark the boundaries between tectonic plates
b) reverse roles in the Southern Hemisphere
c) have no relationship to plate tectonics
d) occur in the middle of tectonic plates

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