Geologic History Discussion

Description

QUESTION 1

  1. Which of the following best describes the use of relative dating?

3 points

QUESTION 2

  1. Which of the following best defines the principle of cross-cutting relationships?

3 points

QUESTION 3




  1. Which principle allows you to know that the fault labeled as feature F is younger than the rock body labeled as feature B?





3 points

QUESTION 4

  1. Which principle tells us that rock layers separated by a valley, but otherwise similar, are assumed to have once been continuous?

3 points

QUESTION 5

  1. Organisms with hard mineralized parts, such as shells or bones, are found in the fossil record, but organisms without such hard parts are not preserved as fossils.

2 points

QUESTION 6

  1. Which scientist is known for first recognizing the principle of faunal succession?

3 points

QUESTION 7

  1. A fossil that is used to assign an age to the rock layer in which it is found is called an indicator fossil.

2 points

QUESTION 8

  1. The science of dating rocks by using fossils is called biostratigraphy.

2 points

QUESTION 9

  1. While the principle of original horizontality is widely applicable, there are some exceptions to it, such as sand deposits that can be laid down at slight angles.

2 points

QUESTION 10

  1. Discuss how relative and absolute dating are used to assign ages to rocks. Specifically, how are the two dating methods different from each other? Discuss the technique of absolute dating commonly used to date rocks.






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5 points

QUESTION 11

  1. Biostratigraphy is an important absolute dating technique.

2 points

QUESTION 12

  1. Which of the following terms best describes the nucleus of a radioactive element?

3 points

QUESTION 13

  1. When a radioactive isotope decays, it gives off energy and produces a product called a

3 points

QUESTION 14

  1. Uranium-lead radiometric dating is most often performed on the mineral

3 points

QUESTION 15

  1. Patterns in tree rings provide clues about the past climate of an area.

2 points

QUESTION 16

  1. If a radioactive nuclide has a half-life of 1.3 billion years and it is determined that a rock is about 3.9 billion years old, how many half-lives have elapsed since the rock crystallized?

3 points

QUESTION 17

  1. If a radioactive nuclide has a half-life of 1.3 billion years and it is determined that a rock contains 25% of its original amount of this nuclide, about how old is the rock?

3 points

QUESTION 18

  1. Glacial varves are characterized by dark-colored bands of clay-sized sediment alternating with light-colored bands of sand-sized sediment.

2 points

QUESTION 19

  1. Early attempts to develop a geologic time scale were based on

3 points

QUESTION 20

  1. Which of the following is the smallest defined unit of time on the geologic time scale?

3 points

QUESTION 21

  1. On the geologic time scale, eons are immediately divided into

3 points

QUESTION 22

  1. At the end of which geologic period did the dinosaurs become extinct?

3 points

QUESTION 23

  1. Which period of geologic history marks a time of life rapidly becoming more complex and a time for which we have an extensive fossil record?

3 points

QUESTION 24

  1. The beginning of the Triassic period is marked by a large mass extinction event.

2 points

QUESTION 25




  1. On the given diagram, the numbers 52 through 63 represent different rock layers. The lowercase letters m, n, p, and q represent times in geologic history (ages of the rocks). The uppercase letters A through D represent different fossil organisms. Location X represents the geologic (world-wide) time range of the fossil species A through D. Which statement is true, based on the given diagram?





3 points

QUESTION 26

  1. Seed-bearing plants and large forests first become widespread during the Devonian.

2 points

QUESTION 27




  1. According to the map, from what division of time are the oldest rocks in Yosemite?





3 points

QUESTION 28

  1. Earth’s atmospheric ozone layer is one of the unique features that allows it to support life. What function does the ozone layer serve?

3 points

QUESTION 29

  1. During which part of geologic time did photosynthesis evolve?

3 points

QUESTION 30

  1. According to the fossil record, when did life first emerge on Earth?

3 points

QUESTION 31

  1. Natural selection is most responsible for which of the following?

3 points

QUESTION 32

  1. Over time, natural selection results in species that are

3 points

QUESTION 33




  1. The image shows how different species have similar forearms structurally, even though they used them for different purposes. This is an example of homology and is evidence for evolution.





2 points

QUESTION 34

  1. The human arm, cat forelimb, bat wing, and whale front flipper are all structurally similar, even though these structures serve different purposes for each animal. What is this called and how is it evidence for evolution?



























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5 points

QUESTION 35

  1. Through natural selection, environmental pressures can alter the range of traits observed in a species over time.

2 points

QUESTION 36

  1. Natural selection acts only on individual organisms and cannot affect the survivability of an entire species.

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