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[DOC File]Rocks and Minerals
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4. How old is a fossil that has radioactively decayed through 4 half-lives of carbon-14? (1) 5,700 years (3) 22,800 years (2) 17,100 years (4) 28,500 years. 5. The division of Earth’s geologic history into units of time called eons, eras, periods, and epochs is based on …
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[DOCX File]www.as.arizona.edu
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Fifteen years ago, a quasar was observed that was found to be located 8 billion light years away. If our universe is approximately 15 billion years old, when did the quasar emit the light that we observe? 15 years ago. 7 billion years ago. 8 billion years ago. 15 billion years ago. 23 billion years ago
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Chapter 5: Interpreting Earth’s History
The earth probably formed from rock, dust and gases that were pulled together by gravitational forces about 4.6 Billion years ago. Geologists work like detectives to figure out what has happened since that time. There are 6 principles that help scientists figure out what has happened in the past:
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[DOC File]Lesson 1 | Geologic History and the Evolution of Life
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When Earth was a scant 50 million years old, an infant planet still forming and still largely molten, it collided with an object about the size that Mars is today. Fragments of the object and much of Earth’s crust were flung into space. Quickly, this material assumed an orbit around Earth.
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[DOCX File]Background Information
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The sun is made up of mostly hydrogen and helium, and is approximately 4.6 billion years old. Earth is a geologically active planet with a surface that is constantly changing. Unlike Venus, Mercury, and Mars, it has large amounts of water and an oxygen-rich atmosphere. Earth’s moon is about ¼ the diameter of Earth, and is a rocky satellite.
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[DOC File]101 Amazing Earth Facts - Education World
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60. How old is Earth? Our planet is more than 4.5 billion years old, just a shade younger than the Sun. Recent evidence actually shows that Earth was formed much earlier than previously believed, just 10 million years after the birth of the Sun, a stellar event typically put at 4.6 billion years ago. 61. What is the world’s largest desert?
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How old is the earth today