Question 1

Explain, in the context of the rock cycle, how a metamorphic rock can become sedimentary rock again.

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Question 2

Why do you think the geological time scale is usually not drawn to scale when shown on a single page of a book?

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Question 3

Consider the table in the chapter listing the various silicate structures of common rock-forming minerals. Determine the silicon to oxygen ratio for each type and express it as a decimal fraction. This can be done by dividing the number of silicon atoms by the number of oxygen atoms. In the first category (isolated tetrahedral), for example, the ratio is 1:4 or 0.25. What can you conclude from this?

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Question 4

How do the continents move in plate tectonics without being broken up by the stresses involved?

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Question 5

What distinguishes the lithosphere from the asthenosphere?

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Question 6

Contrast the difference in the volume of ice at the south pole versus the north pole. Which has more? Why?

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Question 7

What is the significance of the alignment of seamounts and islands of the Hawaii-Emperor Seamount chain and other similarly oriented alignments to the south (e.g., Tuamotu Islands and Line (Austral) Islands)?

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Question 8

What are the forces that are thought to cause movement of lithospheric plates in plate tectonics?

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Question 9

What would the world be like if plate tectonics was not happening?

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Question 10

Explain how the rock cycle relates to the theory of plate tectonics.

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Quiz 3: The Solid Earth