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Earth Science
Chapter 20
Worksheet 2
Name: ____________________________
Block: _____________________________
Circle the letter that corresponds to the correct answer
1. Approximately how much of Earth’s surface is below sea level?
a. 10 percent
b. 30 percent
c. 70 percent
d. 90 percent
2. Approximately how much of Earth’s surface is above sea level?
a. 10 percent
b. 30 percent
c. 70 percent
d. 90 percent
3. The largest percentage of Earth’s surface above sea level ranges in elevation from 0 km to
a. 0.5 km
b. 0.8 km
c. 1 km
d. 2 km
4. How far below sea level is the largest percentage of Earth’s surface?
a. 0 – 1 km
b. 1 – 2 km
c. 3 – 4 km
d. 4 – 5 km
5. Oceanic crust is made of
a. Basalt and is denser than continental crust
b. Granite and is denser than continental crust
c. Basalt and is less dense than continental crust
d. Granite and is less dense than continental crust
6. During oceanic-oceanic convergence, where do island arc volcanoes form?
a. On the plate that is subducted
b. On the plate that is not subducted
c. Do not form on either plate
d. Form on both plates
7. Organize the terms mantle, continental crust, and oceanic crust in order of increasing density
a. Mantle, oceanic crust, continental crust
b. Oceanic crust, mantle, continental crust
c. Continental crust, oceanic crust, mantel
d. Oceanic crust, continental crust, mantle
8. At which type of plate boundary do the highest mountains form?
a. Convergent; continental-continental
b. Convergent; continental-oceanic
c. Divergent; oceanic-oceanic
d. Divergent; oceanic-continental
Use each of the terms below to complete the passage
equilibrium
Isostatic rebound
mantle
mountains
roots
seamounts
smaller
Isostasy is a condition of (9) _______________ between the mass of Earth’s crust and the buoyancy
of the mantle. Topographic highs in the crust have deep (10) _________ that extend into the mantle
and provide buoyant support. Continents are said to float on the denser (11) ____________.
As (12) ______________ rise, deep roots form. As mountains are eroded, their roots become
(13) _______________. As material is removed from mountains by erosion, the curst slowly rises.
This process is known as (14) __________________. Such crustal movements resulting from
isostasy are not restricted to continents, but also occur when volcanic mountains on the seafloor,
called (15) __________________, form.
Match the definitions to the correct word or term
____
16. Adirondack Mountains
____
17. Basin and Range Province
a. Region of very broad uplift at a divergent plate boundary on
the ocean floor
b. Igneous rock that form along ocean ridges
____
18. Fault-block mountain
c.
____
19. Mauna Kea
____
20. Ocean ridge
____
21. Pillow basalts
e. Forms when large pieces of crust are tilted, uplifted, or
dropped between long faults
f. Example of fault-block mountains
____
22. Uplifted mountains
g. Form when plates move over hot spots in Earth’s mantle
____
23. Solitary volcanic mountains
h. Example of hot-spot volcanic peak
Forms when a large region of Earth’s crust is uplifted as a
unit
d. Example of uplifted mountains
Answer the following questions
24. How do the mountains that form along an oceanic-oceanic convergent boundary differ from those
associated with an oceanic-continental convergent boundary?
25. What happens when a continental plate converges with another continental plate?
26. What causes regional uplift?
27. Describe how fault-block mountains form
28. How did the mountains of Hawaii form?