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Quiz 8 Geol

Which of the following gases was NOT part of Earth's original atmosphere? oxygen
The most common Precambrian fossils are ________, layered mounds of calcium carbonate. stromatolites
The ________ era is known as the "age of flowering plants." Cenozoic
________ are among the most widespread Paleozoic fossils Brachiopods
As the solar system began forming, the first materials to condense into small particles were ________ and nickel. ? oxygen - silicon - nitrogen - carbon ? none of these
Which one of the following represents the greatest expanse of geological time? Precambrian
During the early Paleozoic era, South America, Africa, Australia, Antarctica, India, and perhaps China comprised the vast southern continent of ________ Gondwanaland
Which type of bacteria thrive in environments that lack free oxygen anaerobic
Which era of geologic time spans about 88 percent of Earth's history Precambian
The ________ means "the Sun in the making." protosun
Mammals became the dominant land animals during the ________ era Cenozoic
The ________ period was a time of major extinctions, including 75 percent of amphibian families. Permian
The beginning of the Cambrian period marks an important event in animal evolution — the appearance of organisms with _______ hard parts
The era of "ancient life" is the ________ era. ? Cenozoic - Precambian - Neolithic - Mesozoic ? none of these
Due to a virtual absence of land plants and certain animals, fossil fuels are notably absent in ________ rocks Precambian
The major source of free oxygen in the atmosphere is from ________ green plants
The age of Earth is about ________. 4.5 billion years
The Precambrian rock record indicates that much of Earth's first free oxygen combined with ________ dissolved in water. iron
Which one of the following does NOT characterize the early development and specialization of the primitive mammals increase in stomach capacity
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? Mercury and Earth
Abundant fossil evidence did not appear in the geologic record until about ________ 540 million years ago
During the late Paleozoic, the present-day North America, Europe, western Asia, Siberia, and perhaps China formed the northern continent of ________. Laurasia
Most ________ rocks are devoid of fossils, which hinders correlation of rocks. Precambrian
The ________ period is sometimes called the "golden age of trilobites." Cambrian
________ means "planets in the making." protoplanet
The process in which plants use light energy to synthesize food sugars from carbon dioxide is called ________. photosynthesis
The beginning of the ________ era is marked by the appearance of the first life forms with hard parts. Paleozoic
Each continent contains large "core areas" of Precambrian rocks referred to as _______ shields
By the close of the Paleozoic, all the continents had fused into the single super continent of ________. Pangea
Earth's primitive atmosphere evolved from gases ________. expelled from within
The most economically important resource in Cenozoic strata of the Gulf Coast is _______ petroleum
The waste gas released by plants as they synthesize food sugars from carbon dioxide and water is ______ oxygen
Most of Earth's iron ore occurs in middle ________ rocks Precambrian
The first true terrestrial animals were the _______ reptiles
This least understood era of Earth's history has not been subdivided into briefer time units (according to the book) Precambrian
During the ________ period, large evaporite deposits of rock salt and gypsum formed in North America. Silurian
The supercontinent of Pangaea began to break up during the ________ era. Mesozoic
Which era is sometimes called the "age of dinosaurs? Mesozoic
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 Mesozoic
By the ________ period, large tropical swamps extended across North America, eventually becoming the vast coal deposits of today Pennsylvanian
One group of reptiles, exemplified by the fossil Archaeopteryx, led to the evolution of _______ birds
Which period is known as the "age of fishes"? Devonian
During the Cenozoic, plate interactions gave rise to many events of mountain building, volcanism, and earthquakes in ________ North America western
The cells of these primitive organisms lack organized nuclei and they reproduce asexually. prokaryotes
Following the reptilian extinctions at the close of the Mesozoic, two groups of mammals, the marsupials and ________, evolved. placentals
Cambrian - Mississippian - Jurassic - Devonian Jurassic
trilobites - brachiopods - fish - dinosaurs dinosaurs
Cenozoic - Phanerozoic - Mesozoic - Paleozoic Phanerozoic
The decay of radioactive atoms, coupled with heat released by colliding particles, produced at least some melting of Earth's early interior. T
We are now living in the Mesozoic era. F
Most Mesozoic rocks are devoid of fossils; consequently this is the least understood span of Earth's history F
Probably the single most characteristic feature of the Precambrian is its great abundance of fossil evidence. F
Due to differentiation, the lighter, gaseous materials escaped Earth's interior and became the primitive atmosphere. T
During the early Paleozoic era, the continent of Gondwanaland included North and South America. F
The bodies of our solar system began forming about 5 billion years ago from an enormous cloud of minute rocky fragments and gases. T
The first true terrestrial land animals were the mammals. F
Earth's original atmosphere, several billion years ago, was similar to the present atmosphere. F
The Cenozoic era is the age of mammals. T
The major source of oxygen in Earth's atmosphere is from the decay of plants F
The supercontinent of Pangaea formed during the late Mesozoic era. F
Much of the original free oxygen in the atmosphere combined with iron dissolved in water to become iron oxide. T
During the Cenozoic era, the eastern and western margins of North America experienced similar geologic events. F
The large outer planets (Jupiter, Saturn, Uranus, and Neptune) contain huge amounts of hydrogen and other light materials as part of their composition. T
Fossil fuels are abundant in Precambrian rocks. F
A major event of the Mesozoic era was the breakup of the supercontinent called Pangaea. T
The fault-block mountains of Nevada and Mexico formed during the Cenozoic era. T
When Earth's primitive surface cooled below water's boiling point, torrential rains slowly filled low areas, forming oceans. T
Volcanic activity was common in western North America during much of Cenozoic time. T
The earliest land plants had large, broad leafs to efficiently intercept sunlight. F
Mammals replaced reptiles as the dominant land animals in the Cenozoic era. T
A wave of late Pleistocene extinctions rapidly eliminated many large mammals. T
The beginning of the Precambrian era is marked by the appearance of the first life forms with hard parts. F
Many reptile groups became extinct at the close of the Cenozoic era. F
During the Cenozoic era, a great wedge of sediments from the eroding Rockies created the Great Plains. T
Created by: yphan