Download CRCT Review - Chapter 7 Plate Tectonics.

Name ____________________
Date _________________ Class: ____
Chapter 7: Plate Tectonics
THE COMPOSITION OF THE EARTH
1. List the layers of the Earth, based on their chemical composition.
a. __________________________________
c. ________________________________
b. __________________________________
d. _________________________________
_______________________________________________________________
2. What three elements make up most of the Earth’s crust?
a. ________________________
b._____________________
c. ____________________
3. Which is denser, the oceanic crust or the continental crust? Why? __________________________
_______________________________________________________________________________
4. What element makes up most of the Earth’s core? _______________________________
THE PHYSICAL STRUCTURE OF THE EARTH
Match the correct description with the correct term. Write the letter in the space provided.
_____ 5. the outermost, rigid layer of the Earth
_____ 6. a layer of slowly flowing rock in the mantle
_____ 7. the liquid layer of the core
_____ 8. the solid layer of the core
a.
b.
c.
d.
e.
asthenosphere
lithosphere
mesosphere
outer core
inner core
_____ 9. the strong, lower part of the mantle
WEGENER’S CONTINENTAL DRIFT HYPOTHESIS
_____ 10. What hypothesis by Alfred Wegener explains why continents seem to fit together?
a. continental spreading
c. Wegener’s puzzle
b. plate tectonics
d. continental drift
_____ 11. What did Wegener hypothesize happened to the continents?
a. They broke up and re-formed.
b. They drifted together to form a single continent.
c. They broke up and drifted to their current locations.
d. They sank into the ocean.
________________ 12. Wegener thought that all of the present continents were once joined 245 million
years ago in a landmass he called _________.
_____ 13. How do fossils help explain continental drift?
a.Fossils show that animals crossed the Atlantic.
b.Fossils show when drift happened.
c.Fossils formed when drift happened.
d.The same kind of fossils are on both sides of the Atlantic.
Mid-Ocean Ridges and Sea-Floor Spreading
_____ 14. What discovery led scientists to accept Wegener’s continental drift hypothesis?
a. Pangaea
b.seismographs
c. sea-floor spreading
d. magma
Evidence for Sea-Floor Spreading: Magnetic Reversals
_____ 15. What is it called when Earth’s magnetic poles change places?
a. mid-ocean reversal
b. magnetic reversal
c. polar drift
d. sea-floor reversal
Magnetic Reversals and Sea-Floor Spreading
_____ 16. What is shown by magnetic minerals spreading from a mid-ocean ridge?
a.that mid-ocean ridges exist
b. that ocean volcanoes happen
c. that tectonic plates exist
d. that sea-floor spreading happens
TECTONIC PLATE BOUNDARIES
_____ 17. The place where tectonic plates touch is known as the
a. continental plate.
b.tectonic boundary
c. magma zone.
d. tectonic ridge.
_____ 18. Which of the following is NOT a type of tectonic plate boundary?
a. convergent boundary
b.fault-block boundary
c. divergent boundary
d.transform boundary
19. When two plates with continental crust collide, what happens to the continental crust?
______________________________________________________________________________
Match the correct definition with the correct term. Write the letter in the space provided.
_____ 20. boundary formed when tectonic plates collide
_____ 21. boundary formed when tectonic plates separate
_____ 22. boundary formed when tectonic plates slide past horizontally
a. transform boundary
b. convergent boundary
c. divergent boundary
____________________ 23. Which type of boundary produces strike-slip faults?
____________________ 24. Which type of boundary produces earthquakes?
25. Identify the faults shown in the images below.
a.
b
.
c.