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Chapter 22 Review The Precambrian Earth. What information about Earth’s materials can be inferred by their arrangement in layers, as shown here? 1.their.

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Presentation on theme: "Chapter 22 Review The Precambrian Earth. What information about Earth’s materials can be inferred by their arrangement in layers, as shown here? 1.their."— Presentation transcript:

1 Chapter 22 Review The Precambrian Earth

2 What information about Earth’s materials can be inferred by their arrangement in layers, as shown here? 1.their relative densities 2.their order of formation 3.their relative ages 4.their temperatures

3 Which point on this time line should be labeled “Formation of Earth?” 1.A 2.B 3.C 4.D

4 Which line best represents the level of oxygen gas in the atmosphere during the Proterozoic? 1.A 2.B 3.C 4.D

5 Which graph correctly represents the relationship of the Precambrian to the total age of Earth? 1.A 2.B 3.C 4.D

6 What discovery would weaken the primordial soup hypothesis of the origin of life? 1.Lightning was common on early Earth. 2.Earth’s early atmosphere contained carbon dioxide, water, and trace gases. 3.Earth’s early oceans were warm and shallow. 4.Asteroid impacts were uncommon when life is presumed to have begun.

7 A scientist can assume that this life form did not exist during the Precambrian because________. 1.it is unicellular 2.it contains a nucleus 3.it contains RNA and DNA 4.it has a cell membrane

8 What characteristic of Ediacaran biota leads scientists to think that these organisms do NOT represent relatives of present day animals? 1.lack of a mouth, anus, or gut 2.shapes that are dissimilar to all living organisms 3.structures that were used for movement 4.lack of nuclei

9 Which summarizes the relationship between density of an element and its distribution in Earth? 1.The greater an element’s density, the greater the amount of it found in the crust. 2.The denser an element is, the smaller the amount of it in Earth’s core. 3.The lower an element’s density, the smaller the amount of it found in the crust. 4.The greater an element’s density, the smaller the amount of it found in the crust.

10 Which diagram best represents the relationship of the landmass of Archean cratons to the total landmass of Earth? 1.A 2.B 3.C 4.D

11 Which best summarizes the change in number and size of microcontinents during the Proterozoic? 1.the number of microcontinents increased and the size increased 2.the number of microcontinents increased and the size decreased 3.the number of microcontinents decreased and the size increased 4.the number of microcontinents decreased and the size decreased

12 The oldest known mineral on Earth is ____. 1.fluorite 2.mica 3.zircon 4.quartz

13 An organism composed of a single cell that does not contain a nucleus and is the simplest kind of cell is a(n) ____. 1.prokaryote 2.eukaryote 3.bryozoan 4.animal

14 The process by which volcanoes vent water vapor, carbon dioxide, nitrogen, and other substances is called ____. 1.oxidation 2.glaciation 3.differentiation 4.outgassing

15 Cyanobacteria use the process of ____ to produce energy, and oxygen is given off as a waste product. 1.oxidation 2.differentiation 3.photosynthesis 4.glaciation

16 ____ have been found in the waters of hydrothermal vents, suggesting that proteins and nucleic acids could have formed there during the Archean. 1.Amino acids 2.RNA molecules 3.DNA molecules 4.Dissolved minerals

17 Ancient continent that contained core of modern-day North America 1.asteroid 2.banded iron formation 3.Canadian shield 4.Laurentia 5.meteorite 6.Precambrian shield 7.red bed

18 Continental core of Archean and Proterozoic rock A.asteroid B.banded iron formation C.Canadian shield D.Laurentia E.meteorite F.Precambrian shield G.red bed

19 Deposit consisting of alternating bands of chert and iron oxide A.asteroid B.banded iron formation C.Canadian shield D.Laurentia E.meteorite F.Precambrian shield G.red bed

20 Metallic or silica-rich objects that orbit the Sun between the orbits of Mars and Jupiter A.asteroid B.banded iron formation C.Canadian shield D.Laurentia E.meteorite F.Precambrian shield G.red bed

21 Meteor that has fallen to Earth A.asteroid B.banded iron formation C.Canadian shield D.Laurentia E.meteorite F.Precambrian shield G.red bed

22 The Precambrian shield in North America A.asteroid B.banded iron formation C.Canadian shield D.Laurentia E.meteorite F.Precambrian shield G.red bed

23 Sedimentary rocks younger than 1.8 billion years that are colored by the iron oxides in them A.asteroid B.banded iron formation C.Canadian shield D.Laurentia E.meteorite F.Precambrian shield G.red bed

24 Tiny, threadlike photosynthetic organisms 1.amino acids 2.cyanobacteria 3.Ediacaran fauna 4.hydrothermal vent 5.stromatolite 6.Varangian glaciation 7.zircon

25 Mat or mound composed of billions of cyanobacteria 1.amino acids 2.cyanobacteria 3.Ediacaran fauna 4.hydrothermal vent 5.stromatolite 6.Varangian glaciation 7.zircon

26 Stable mineral that commonly occurs in granite amino acids cyanobacteria Ediacaran fauna hydrothermal vent stromatolite Varangian glaciation zircon

27 Glacial event that occurred between 700 and 800 million years ago A.amino acids B.cyanobacteria C.Ediacaran fauna D.hydrothermal vent E.stromatolite F.Varangian glaciation G.zircon

28 Hot water vent at volcanic seafloor rift A.amino acids B.cyanobacteria C.Ediacaran fauna D.hydrothermal vent E.stromatolite F.Varangian glaciation G.zircon

29 Fossils of soft-bodied Proterozoic organisms A.amino acids B.cyanobacteria C.Ediacaran fauna D.hydrothermal vent E.stromatolite F.Varangian glaciation G.zircon

30 Building blocks of proteins A.amino acids B.cyanobacteria C.Ediacaran fauna D.hydrothermal vent E.stromatolite F.Varangian glaciation G.zircon

31 The amount of radioactive isotopes contributing heat to Earth is greater now than it was when Earth was newly formed. 1.True 2.False

32 The movement of the continents was one of the three sources of Earth’s heat when Earth was newly formed. 1.True 2.False

33 Earth’s oceans and atmosphere formed after life on Earth was established. 1.True 2.False

34 Eukaryotes appeared later in Earth’s history than prokaryotes. A.True B.False

35 The process of plate tectonics, the movement of Earth’s plates, started at the end of the Precambrian. 1.True 2.False

36 The average temperature on Earth has changed through the course of Earth’s history. 1.True 2.False

37 Cyanobacteria are classified as prokaryotes. 1.True 2.False

38 Accumulation of oxygen in Earth’s atmosphere resulted in greater amounts of UV radiation reaching Earth. 1.True 2.False

39 The presence of iron oxide in rocks, formed during a specific time period, can be used as evidence of oxygen in the atmosphere during that time period. 1.True 2.False

40 Volcanic eruptions add great amounts of oxygen gas to the atmosphere. 1.True 2.False

41 Asteroids orbit the Sun between the orbit of Mars and Jupiter. 1.True 2.False

42 Granite, which is composed of feldspar, quartz, and mica— high-density minerals—is common at Earth’s surface. 1.True 2.False

43 Earth’s first granitic crust likely formed from slabs of crust that were recycled into the mantle at subduction zones. 1.True 2.False

44 The oldest rock samples collected from the Moon are approximately 4.6 million years old. 1.True 2.False

45 Early in the Proterozoic, microcontinents began to collide as a result of plate tectonics. 1.True 2.False

46 Earth’s early atmosphere likely contained large concentrations of water vapor, and oxygen and nitrogen gases vented from volcanoes. 1.True 2.False

47 Early life, mainly the Ediacaran fauna, modified the atmosphere by generating large amounts of the gas that eventually formed the ozone layer. 1.True 2.False


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