Earths magnetic field ____.
a. changes polarity due to motions in Earths mantle, while plate motion remains relatively stable
b. changes polarity due to motions in Earths core, while plate motion remains relatively stable
c. changes polarity due to motions in Earths crust, while plate motion remains relatively stable
d. remains stable, while plate motion oscillates back and forth
e. remains stable, while magma motion oscillates back and forth
Question 2Wegener used ____.
a. only geographic information from maps in forming the theory of continental drift
b. only geological information from rock composition in forming the theory of continental drift
c. geographic and geological information to form the theory of continental drift
d. geographic and geological information to form the theory of plate tectonics
e. geographic and geological information to disprove the theory of plate tectonics
Question 3The alternating stripes of magnetic field patterns are used to explain ____.
a. seafloor spreading
b. island chains
c. transform faults
d. stratovolcanoes
e. oceanic trenches
Question 4Oceanic plates are ____.
a. poor in basalt, but rich in silicates
b. an even mix of basalts and silicates
c. rich in basalt and silicates
d. rich in basalt, but poor in silicates
e. poor in basalts and silicates
Question 5Basalt is material that ____.
a. forms most of the material of continental plates
b. is created when rhyolite is subjected to high temperatures
c. is created when serpentine reacts with seawater
d. comes from the mantle relatively unchanged
e. is created only at places where an oceanic plate subducts into the mantle
Question 6Plate motion is responsible for ____.
a. only convergent boundaries
b. only divergent boundaries
c. convergent, divergent, and transform boundaries
d. only convergent and divergent boundaries
e. only divergent and transform boundaries
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