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Earth Science 101 Practice Test: Earth's Evolution through Geologic Time
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Earth Science 101 Practice Test: Earth's Evolution through Geologic Time
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25 Questions

1. Which type of bacteria thrive in environments that lack free oxygen?
2. The waste gas released by plants as they synthesize food sugars from carbon dioxide and water is ________.
3. During the Cenozoic, plate interactions gave rise to many events of mountain building, volcanism, and earthquakes in ________ North America.
4. Each continent contains large core areas" of Precambrian rocks referred to as ________."
5. The cells of these primitive organisms lack organized nuclei and they reproduce asexually.
6. Following the reptilian extinctions at the close of the Mesozoic, two groups of mammals, the marsupials and ________, evolved.
7. The major source of free oxygen in the atmosphere is from ________.
8. As they formed, due to their high temperatures and comparatively weak gravitational fields, which planets were unable to retain appreciable amounts of hydrogen, helium, and ammonia?
9. Abundant fossil evidence did not appear in the geologic record until about ________.
10. The age of Earth is about ________.
11. Which era of geologic time spans about 88 percent of Earth's history?
12. The Precambrian rock record indicates that much of Earth's first free oxygen combined with ________ dissolved in water.
13. The beginning of the ________ era is marked by the appearance of the first life forms with hard parts.
14. The ________ period was a time of major extinctions, including 75 percent of amphibian families.
15. During the ________ era, the westward-moving North American plate began to override the Pacific plate, eventually causing the tectonic activity that ultimately formed the mountains of western North America.
16. Most of Earth's iron ore occurs in middle ________ rocks.
17. By the ________ period, large tropical swamps extended across North America, eventually becoming the vast coal deposits of today.
18. The ________ period is sometimes called the golden age of trilobites.""
19. ________ are among the most widespread Paleozoic fossils.
20. The first true terrestrial animals were the ________.
21. Which one of the following does NOT characterize the early development and specialization of the primitive mammals?
22. Which period is known as the age of fishes"?"
23. The ________ era is known as the age of flowering plants.""
24. During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of ________.
25. Which era is sometimes called the age of dinosaurs?""

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