2.HowtheEarthworks

2.HowtheEarthworks - Lecture 2: How the Earth works Earth...

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Lecture 2: How the Earth works Earth Formation & Structure Plate Tectonics: Unifying theory
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Theory, Hypotheses, Facts, Laws in science In everyday use, 'theory' implies something untested (I have a theory or an idea), and having only a small degree of evidence in its favor. Fact: an observation in science; “facts are stubborn things” John Adam; the sun rises is a fact Theory: A set of statements or principles devised to explain a group of facts or phenomena, especially one that has been repeatedly tested or is widely accepted and can be used to make predictions about natural phenomena http://www.visionlearning.com/librar y/module_viewer.php?mid=177&l=
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Theory, Hypotheses, Facts, Laws in science Hypothesis A tentative explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation. “An idea” In testing hypotheses and theories, it is easy to disprove, but hard to prove Law in science, descriptive generalization about how some aspect of the natural world behaves under stated circumstances. . Because a Law is just a description of how something behaves and it does not explain why it behaves that way, it is usually considered to be below a theory. http://www.indiana.edu/~geol116/week1/week1.html
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A theory is A) Is a series of ideas that can be tested B) A group of widely accepted facts C) Is a description of how something behaves D) A tentative explanation for an observation Clicker question: Theory
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A scientific theory: A. is settled and cannot be disproved. B. is the most reasonable guess that scientists can make until they can collect better data. C. can become a law when enough data are gathered. D. is a comprehensive explanation based on careful analysis of data. E. is the same as a hypothesis. If a scientific theory is based on many different kinds of data, then: A. the theory is not yet precise enough and must be revised. B. different theories are needed to explain all of the different data. C. it will eventually become a law. D. it is considered well-supported. E. it is considered true and correct. Clicker questions: Theory
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What is the age of the universe? What is the age of the Earth? How do we know this? What is the age of oldest dated Earth rocks ? http://pubs.usgs.gov/gip/geotime/age.html
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2.HowtheEarthworks - Lecture 2: How the Earth works Earth...

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