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space and earth
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46
Science
12th Grade
09/24/2013
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4.56 billion years ago
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Earth forms
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first evidence of life
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3.5 billion years ago
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1.1 billion years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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million years ago
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4.56 billion years ago
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Earth forms
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4.4 billion years ago
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oldest mineral grain found
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4.1 billion years ago
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oldest piece of rock ever found
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3.9 billion years ago
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oldest evidence of continent
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3.8 billion years ago
 Definition
first evidence of life
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3.5 billion years ago
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first fossil (algae and bacteria)
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1.8 billion years ago
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free o2 in atmosphere
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1.1 billion years ago
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first
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540 million years ago
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460 million years ago
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440 million years ago
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410 million years ago
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250 million years ago
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247 million years ago
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240 million years ago
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220 million years ago
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145million years ago
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65 million years ago
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30 million years ago
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5 million years ago
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1.8 million years ago
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40,000
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13,000
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8,000
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2,000
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500
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~34
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