____7. Which of the following provide evidence for seafloor spreading?

a. Active volcanoes along the continents.

b. Floating continents and age of continental rocks.

c. Pattern of seafloor magnetic stripes and continental rocks.

d. Pattern of seafloor rock ages and pattern of seafloor magnetic stripes.

____ 8. How would you compare the rocks found along the continents and that of those found

within the seafloor?

a. Rocks found on continents are much older than that of those found within the seafloor.

b. Rocks found on the continents have smoother texture compared to those in seafloor

c. Rocks found on the seafloor are made of skeletons/shells of dead marine animals.

d. Rocks found on the seafloor are brittle while continental rocks are hard.

____9. Which of the following is the approximate rate of seafloor spreading annually?

a. 6-16 cm c. 6-16 feet

b. 6-16 inches d. 6-16 meters

____10. When poles of the earth change their polarity, the process is known as __________.

a. magnetic reversal c. polarization

b. plate tectonics d. seafloor spreading

____11. Which of the following is a scientific theory describing the movements of the plates?

a. continental drift c. plate tectonics

b. magnetic reversal d. seafloor spreading

____12. What do you call the layer through which all plates are riding over?

a. asthenosphere c. outer core

b. crust d. inner core

____13. What do you call the process when molten materials rise up due to the heat coming

from the earth’s inner core?

a. convection c. thermal inversion

b. conduction d. slab pull

____14. What does convection current do?

a. Convection current makes the inner layers of the earth hot.

b. Convection current maintains the solid nature of the earth’s inner layers.

c. Convection current makes the plates to move slowly along the boundaries.

d. Convection current prevents the plates from moving away from one another.