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Earth’s History Created by Educational Technology Network
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Relative Dating Diagrams
Relative Dating laws Relative Dating Diagrams Fossils Absolute dating Geologic time 10 20 30 40 50
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The oldest layer will be on the bottom, the youngest on the top
Question The oldest layer will be on the bottom, the youngest on the top
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Principle of Superposition
Answer 1 – 10 Principle of Superposition
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Question Used to correlate rock layers that are separated by distance
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Principle of Lateral Continuity
Answer 1 – 20 Principle of Lateral Continuity
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Geologic features form after the rocks they cut through
Question Geologic features form after the rocks they cut through
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Principle of Cross-Cutting relationships
Answer 1 – 30 Principle of Cross-Cutting relationships
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The event that will cause an unconformity
Question The event that will cause an unconformity
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Answer 1 – 40 erosion
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Tilted or folded rocks that have younger horizontal rocks on top
Question Tilted or folded rocks that have younger horizontal rocks on top
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Answer 1 – 50 Angular unconformity
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Question What is Z?
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Answer 2 – 10 fault
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Question What is the boundary between N and G?
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Answer 2 – 20 Angular unconformity
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Question Which is older Z or M? How can you tell?
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M – Principle of Cross Cutting Relationships
Answer 2 – 30 M – Principle of Cross Cutting Relationships
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Question What happened to layers X, C, E, N?
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Answer 2 – 40 Folding
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How can you tell which is older P or F?
Question How can you tell which is older P or F?
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Principle of Inclusions
Answer 2 – 50 Principle of Inclusions
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Minerals replace the organism after it is buried
Question Minerals replace the organism after it is buried
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Answer 3 – 10 Petrified
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Question Evidence left behind by an organism
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Answer 3 – 20 Trace fossil
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The actual animal or plant still exists
Question The actual animal or plant still exists
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Answer 3 – 30 Preserved remains
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Question Minerals replace the organism after it is buried
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Answer 3 – 40 Petrified
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Question A hollow area in a rock left when an organism is dissolved leaving a detailed impression
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Answer 3 – 50 mold
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What are radioactive isotopes?
Question What are radioactive isotopes?
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Answer 4 – 10 Unstable elements that will decay into stable elements
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Question What is a half-life?
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Answer 4 – 20 The amount of time it takes for half of a radioactive isotope to decay to a stable isotope
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Question What are index fossils?
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Answer 4 – 30 Fossils of organisms that are widespread and lived during one short period of time.
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Question If you find a rock that has 25% of the unstable (parent isotope) and 75% of the stable (daughter isotope), how many half lives has it gone through?
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Answer 4 – 40 2
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Question If an element has a half life of 1,500,000 years and has gone through 3 half-lives how old is the rock it is found in?
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Answer 4 – 50 4,500,000
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Which era is known as the “Age of Mammals”?
Question Which era is known as the “Age of Mammals”?
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Answer 5 – 10 Cenozoic
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Which era is known as the “Age of Reptiles”?
Question Which era is known as the “Age of Reptiles”?
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Answer 5 – 20 Mesozoic
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Question During which period did an explosion of animal species occur in the oceans?
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Answer 5 – 30 Cambrian
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During which period did mammals first appear?
Question During which period did mammals first appear?
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Answer 5 – 40 Jurassic
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Question How do the events of the Carboniferous benefit us today?
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Answer 5 – 50 They produced coal
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