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STEP
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Discover/Review to Score High
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5 CHAPTER 6 CHAPTER 7 CHAPTER 8 CHAPTER 9 CHAPTER 10 CHAPTER 11 CHAPTER 12 CHAPTER 13 CHAPTER 14 CHAPTER 15 CHAPTER 16 CHAPTER 17 CHAPTER 18 CHAPTER 19
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CHAPTER
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Earth Science Concepts Atmospheric Composition Global Water Resources and Use Soil and Soil Dynamics Ecosystem Structure, Diversity, and Change Natural Cycles and Energy Flow Population Biology and Dynamics Agriculture and Aquaculture Forestry and Rangelands Land Use Energy Consumption, Conservation, and Fossil Fuels Nuclear Energy Alternative and Renewable Energies Pollution Types Global Change and Economics
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CHAPTER
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Earth Science Concepts
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IN THIS CHAPTER Summary: Land mass movements and environmental impacts of natural events have occurred over geological time
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Keywords
KEY IDEA
Geological time, principle of uniformitarianism, plate tectonics, subduction, convection, earthquakes, P and S waves, volcanism, solar intensity, latitude
Investigating Our Environment
The Earth s limitless beauty and complexity provide broad areas for scientific study Researchers from many different fields focus their skills on the mechanisms and interactions of hundreds of environmental factors These natural and industrial factors affect the environment in ways that are known or suspected, as well as those that are totally unidentified Some changes have been taking place for millions of years; others appear to be accelerating Today, environmental scientists are sorting through tons of data to understand impacts of modern processes on the environment
Geological Time
The concept of geological time describes time over millions of years However, for scientists to be sure they are talking about the same time increment, they divide geological time into different amounts These amounts are known as eons, eras, periods, and epochs Table 51 shows the different time divisions
37
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Table 51
Geological time is divided into eras, periods, and epochs
ERA PERIOD EPOCH YEARS (MILLIONS)
Phanerozoic
Cenozoic
Quaternary Tertiary
Holocene Pleistocene Pliocene Miocene Oligocene Eocene Paleocene
01 2 5 25 37 58 66 140 208 245 286 320 365 440 500 545
Mesozoic
Cretaceous Jurassic Triassic
Paleozoic
Permian Carboniferous Devonian Silurian Ordovician Cambrian
KEY IDEA
Time that spans millions of years is known as geological time The entire history of the Earth is measured in geological time
Geological time includes the history of the Earth from the first hints of its formation until today It is measured mathematically, chemically, and through observation Figure 51 shows a geological time clock with one second roughly equal to one million years In 1785, Scottish scientist James Hutton, often called the father of modern geology, tried to figure out the Earth s age He studied and tested local rock layers in an attempt to calculate time with respect to erosion, weathering, and sedimentation Hutton knew that over a few years, only a light dusting of sediments are deposited in an undisturbed area He figured out that sedimentary rock must have been compressed, tighter and tighter, from the weight of upper rock layers over many ages He also thought that changes in a sedimentary rock layer, through uplifting and fracturing of weathering and erosion, could only have taken place over a very long period of time Hutton was one of the first scientists to suggest that the Earth is extremely ancient compared to the few thousand years that earlier theories suggested He thought the formation of different rock layers, the building of towering mountains, and the widening of the oceans must have taken place over millions of years Hutton wrote the principle of uniformitarianism suggesting that changes in the Earth s surface happened slowly instead of all at once His early work paved the way for other geologists to realize the Earth was not in its final form, but still changing Gradual shifting and compression changes occurred across different continental land forms
Earth Science Concepts 39
Mass Ice extinction age Jurassic period Pangea forms Paleozoic era Pangea splits 12 Humans appear Today
Precambrian Era
Compared to ancient eras, our modern time period is very small
Time Measurements
Until the 17th century, people believed the Earth was approximately 6,000 years old This estimate, based on humankind s history, was handed down through stories and written accounts Except for theory, there were no scientific ways to check its accuracy However, in the 1800s, following the early work of geological pioneers like Nicolaus Steno and Hutton, scientists began to test rock samples for their age It was during this time that scientists began to use dating methods which suggested that the Earth was millions or even billions of years old
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