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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?

AMississippi valley BRocky Mountains CLake Erie DGulf of Mexico

2) The thinnest section of the Earth's crust is found beneath

Amountain regions Bdesert regions Ccoastal plains Doceans

3) Which statement best describes Earth's crust and mantle?

AThe crust is thicker and less dense than the mantle. BThe crust is thinner and less dense than the mantle. CThe crust is thicker and more dense than the mantle. DThe crust is thinner and more dense than the mantle.

4) Compared to Earth's oceanic crust, Earth's continental crust is

Athinner and composed of basalt Bthicker and composed of basalt Cthinner and composed of granite Dthicker and composed of granite

5) The oceanic crust is thought to be composed mainly of

Arhyolite Bgranite Cbasalt Dsandstone

6) Compared to the continental crust of central North America, the oceanic crust of the Mid-Atlantic Ridge is

Amore felsic Byounger Cthicker Dless dense

7) Compared to continental crust, oceanic crust is

Aless dense, more mafic, and thinner Bmore dense, more felsic, and thicker Cless dense, more felsic, and thicker Dmore dense, more mafic, and thinner

8) What are the two most abundant elements by mass found in Earth's crust?

Aaluminum and iron Bsodium and chlorine Coxygen and silicon Dcalcium and carbon

9) Where is the thickest part of the Earth's crust?

Aat the edge of continental shelves Bat mid-ocean ridges Cunder continental mountain ranges Dunder volcanic islands

10) To get sample material from the mantle, drilling will be done through the oceanic crust because

Ayounger than continental crust Bmore dense than continental crust Csofter than continental crust Dthinner than continental crust

*select an answer for all questions

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