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Quiz 8 Geol

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
show oxygen  
🗑
The most common Precambrian fossils are ________, layered mounds of calcium carbonate.   show
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show Cenozoic  
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________ are among the most widespread Paleozoic fossils   show
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show none of these  
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show Precambrian  
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During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of ________   show
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Which type of bacteria thrive in environments that lack free oxygen   show
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show Precambian  
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show protosun  
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show Cenozoic  
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show Permian  
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show hard parts  
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show none of these  
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Due to a virtual absence of land plants and certain animals, fossil fuels are notably absent in ________ rocks   show
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The major source of free oxygen in the atmosphere is from ________   show
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The age of Earth is about ________.   show
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The Precambrian rock record indicates that much of Earth's first free oxygen combined with ________ dissolved in water.   show
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show increase in stomach capacity  
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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?   show
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show 540 million years ago  
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During the late Paleozoic, the present-day North America, Europe, western Asia, Siberia, and perhaps China formed the northern continent of ________.   show
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Most ________ rocks are devoid of fossils, which hinders correlation of rocks.   show
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show Cambrian  
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show protoplanet  
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The process in which plants use light energy to synthesize food sugars from carbon dioxide is called ________.   show
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show Paleozoic  
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Each continent contains large "core areas" of Precambrian rocks referred to as _______   show
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show Pangea  
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Earth's primitive atmosphere evolved from gases ________.   show
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The most economically important resource in Cenozoic strata of the Gulf Coast is _______   show
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show oxygen  
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Most of Earth's iron ore occurs in middle ________ rocks   show
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show reptiles  
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show Precambrian  
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During the ________ period, large evaporite deposits of rock salt and gypsum formed in North America.   show
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The supercontinent of Pangaea began to break up during the ________ era.   show
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show Mesozoic  
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show Mesozoic  
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show Pennsylvanian  
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show birds  
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show Devonian  
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show western  
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show prokaryotes  
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Following the reptilian extinctions at the close of the Mesozoic, two groups of mammals, the marsupials and ________, evolved.   show
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show Jurassic  
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show dinosaurs  
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Cenozoic - Phanerozoic - Mesozoic - Paleozoic   show
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show T  
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We are now living in the Mesozoic era.   show
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show F  
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show F  
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show T  
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During the early Paleozoic era, the continent of Gondwanaland included North and South America.   show
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The bodies of our solar system began forming about 5 billion years ago from an enormous cloud of minute rocky fragments and gases.   show
🗑
show F  
🗑
Earth's original atmosphere, several billion years ago, was similar to the present atmosphere.   show
🗑
show T  
🗑
show F  
🗑
show F  
🗑
Much of the original free oxygen in the atmosphere combined with iron dissolved in water to become iron oxide.   show
🗑
show F  
🗑
show T  
🗑
show F  
🗑
show T  
🗑
The fault-block mountains of Nevada and Mexico formed during the Cenozoic era.   show
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show T  
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show T  
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show F  
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Mammals replaced reptiles as the dominant land animals in the Cenozoic era.   show
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show T  
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The beginning of the Precambrian era is marked by the appearance of the first life forms with hard parts.   show
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show F  
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show T  
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