science earth history – Flashcards
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4.6 billion
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scientific evidence suggests that the earth is ________ years old
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rocks fossils
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evidence for events that occurred in the earths history is provided by____ and the ____ within the rocks
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relative age
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the ________ ___ of the rocks can be found by the way the rocks are layered
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older younger
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______ rock are found deeper, ______ rocks are found closer to the surface
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superposition
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the older rocks are found deeper and the younger rocks are found closer to the surface. this law is called______
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absolute age radioactive radio metric dating
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the ______ ___ of rock layers can be determined by _____ elements in the rocks. this is known as _____ _____
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oldest
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this was done on the _______ rocks found on the earth
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biodiversity life
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the divisions of the geologic time scale represent major changes in the ______ of _____
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bacteria
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the earliest life on earth was simple______
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jellyfish
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then algae, worms and ______ appeared
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complex
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life became more _______ as the earth grew older
