Example Exam 1 - Geoscience 001 Fall 2005 Exam #1 Version B...

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Geoscience 001 Fall 2005 Exam #1 Version B answers at end of exam Be sure to enter the version of your exam on the test answer form!! 4. Does magma formed at mid-ocean ridges have the same composition as the mantle? a) yes — both are composed of basalt or gabbro b) yes — both are composed of peridotite c) no — the ocean crust is basaltic and the mantle is peridotite d) no — the ocean crust is peridotite and the mantle is basalt 5. What is the composition of most of the magma formed at a subduction zone? a) basaltic b) andesitic c) granitic and basaltic d) basaltic and andesitic
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6. How is magma made at a subduction zone? a) frictional heating as one plate slides by another b) increased pressure inevitably leads to melting of the subducting plate c) water released from the subducting plate lowers the melting point of the overlying mantle d) increased temperature leads to melting of the subducting plate 7. How does magma form at a mid-ocean spreading ridge? a) water circulates down into the mantle and triggers melting by lowering the melting point of the mantle b) the underlying mantle is molten everywhere and simply rises to the surface where it gets a chance; the diverging plates provide that chance c) mantle rising to fill the void created by diverging plates undergoes a pressure decrease that triggers partial melting of the mantle 8. How do we know that the outer core of the earth is liquid? a) P-waves slow down as they pass through this region b) S-waves do not pass through this region c) Neither P-waves nor S-waves pass through this region 9. What is the origin of the magnetic anomaly stripes on the ocean floors?
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This note was uploaded on 03/17/2008 for the course GEOSC 001 taught by Professor Tormey,brian during the Spring '08 term at Pennsylvania State University, University Park.

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Example Exam 1 - Geoscience 001 Fall 2005 Exam #1 Version B...

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