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Crustal Composition
Test Description: Compares composition and size of the continental and oceanic crust.
Instructions: Answer all questions to get your test result.
1) At which location would seismic measurements indicate that the Earth's crust is thickest?
A
Rocky Mountains
B
Lake Erie
C
Gulf of Mexico
D
Mississippi valley
2) The thinnest section of the Earth's crust is found beneath
A
coastal plains
B
mountain regions
C
oceans
D
desert regions
3) Which statement best describes Earth's crust and mantle?
A
The crust is thicker and more dense than the mantle.
B
The crust is thinner and less dense than the mantle.
C
The crust is thicker and less dense than the mantle.
D
The crust is thinner and more dense than the mantle.
4) Compared to Earth's oceanic crust, Earth's continental crust is
A
thicker and composed of granite
B
thinner and composed of granite
C
thinner and composed of basalt
D
thicker and composed of basalt
5) The oceanic crust is thought to be composed mainly of
A
sandstone
B
basalt
C
rhyolite
D
granite
6) Compared to the continental crust of central North America, the oceanic crust of the Mid-Atlantic Ridge is
A
younger
B
less dense
C
more felsic
D
thicker
7) Compared to continental crust, oceanic crust is
A
more dense, more mafic, and thinner
B
less dense, more mafic, and thinner
C
less dense, more felsic, and thicker
D
more dense, more felsic, and thicker
8) What are the two most abundant elements by mass found in Earth's crust?
A
sodium and chlorine
B
calcium and carbon
C
oxygen and silicon
D
aluminum and iron
9) Where is the thickest part of the Earth's crust?
A
under continental mountain ranges
B
at mid-ocean ridges
C
under volcanic islands
D
at the edge of continental shelves
10) To get sample material from the mantle, drilling will be done through the oceanic crust because
A
softer than continental crust
B
more dense than continental crust
C
thinner than continental crust
D
younger than continental crust
*select an answer for all questions
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