Geol 101 Physical Geology Past Exam Questions Lecture 8 (Page 2 of 3) in pdf

D. the earth would collapse in on itself if it had a liquid interior

E. none of the above because the inside of the earth is completely molten

8. A mineral that is heated up and melts at 800°C in an oven at the Earth’s surface may remain a solid at 800°C

deep down in the Earth’s crust because:

A. there is less water present

B. oxygen in the atmosphere affects the melting temperature

C. the melting point is different at sea level than higher up

D. all minerals remain solid in the Earth’s crust

E. the melting temperature rises as pressure increases

8. As a rock starts to melt, the minerals with the lowest melting temperature will start to melt first, forming magma.

This melted portion can get squeezed away from the still solid part of the rock through a process called:

A. partial melting

B. fractionation

C. differentiation

D. volcanic eruption

E. crystallization

8. After partial melting of a rock occurs in the Earth’s crust, the process whereby the melt moves away from the

remaining solid portion of the rock is called:

A. the squeegee effect

B. volcanic eruption

C. fractionation

D. magmatic differentiation

E. Bowen’s reaction series

8. The type of magma that contains the most silica is:

A. felsic

B. intermediate

C. mafic

D. ultramafic

E. it depends on the temperature

8. The different types of magma, listed in order from lowest to highest silica content, are:

A. felsic, intermediate, mafic, ultramafic

B. felsic, mafic, intermediate, ultramafic

C. mafic, ultramafic, intermediate, felsic

D. ultramafic, mafic, felsic, intermediate

E. ultramafic, mafic, intermediate, felsic

8. The viscosity of lava is a measure of:

A. the temperature when melting occurs

B. the speed it flows

C. the amount of silica present in the lava

D. the ability of the lava to resist flowing downhill

E. the amount of dissolved gas in the lava

8. Which of the following types of lava has the lowest viscosity and therefore flows the fastest and furthest?

A. felsic

B. intermediate

C. mafic

D. ultrafelsic

E. intermafic

8. Which of the following types of lava has the highest viscosity and therefore has great difficulty flowing?

A. felsic

B. ultramafic

C. mafic

D. intermediate

E. ketchup

Geol 101 Physical Geology Past Exam Questions Lecture 8 Page 2

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