Geol 100 Exam #3 – Flashcards
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What type of stress formed the structure shown in this figure?
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tension
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What type of stress formed the structure shown in this figure?
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shear
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What type of structure is shown in this photograph?
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fault
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What does the horizontal line along the intersection of the plane and the water represent?
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the strike of the surface
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What type of stress could form the fault in this figure?
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horizontal compression
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What type of structure is shown in this figure?
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anticline
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Which of the following matches a sedimentary rock with a possible metamorphic equivalent?
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shale - slate
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Which of the numbers on this figure indicates high pressure/low-temperature metamorphic conditions?
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3
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What type of feature is shown in this photograph?
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fault zone
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What kind of structure is shown in this image?
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strike-slip fault
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This photograph shows an upper light-colored conglomerate and a lower dark basalt. Which of the following statements is true?
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the conglomerate is younger because it contains clasts of the dark basalt
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Which principle of relative age dating can be used to determine when the river formed on the landscape?
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cross-cutting relations
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This figure shows a disconformity between an upper dark layer (being deposited by the sea) and a lower light-colored layer. What happened to form this disconformity?
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The boundary between the two units indicates that for a time there was either erosion or no deposition.
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If a rock started with 1,000 atoms of a parent but now contains 250 atoms, how many half lives have passed?
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2 half lives
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The impressions of fossil shells in this photograph probably indicate that the rock was deposited:
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in the sea
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Unit C is present in the left column but not the right column because:
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it was not deposited or was eroded away
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This figure shows two sections of rocks. What is the youngest unit?
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unit 9
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Which of the following forms different layers from season to season and can be used to determine how many years the layers represent?
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all of these
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What were some of the earliest forms of life on Earth?
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microscopic creatures that built mound-shaped structures called stromatolites
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What was the Cambrian explosion?
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a time when many different types of creatures appeared on Earth
