Topic%2002_Early%20Days

Topic%2002_Early%20Days - Early Days Read chapters 2, 3, 4...

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Early Days Read chapters 2, 3, 4 of text. The earth reached approximately its present size in a matter of how many years? Clues about the matter from which Earth formed come from these. Meteors do this in the earth's atmosphere. A prolific sources of meteorites. This element has sunk to the center of the planet to form the core. That the earth was created in the this year held sway well into the nineteenth century. Determining the earth' s age precisely depends upon the fact that these decay at a constant known rate. Earth and meteorites formed from a common ancestral material how long ago? The age of the oldest known rock.
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These commonly contain mineral grains eroded from even older continents. These crystals from sandstones in Australia have ages of 4.4 billion years! Zircons incorporate considerable amounts of this dateable radio- element. Zircons are common in ( continental, oceanic) rocks. Possible reasons why crustal rock is not preserved from approximately the first half billion years of our planet's existence: 1) _________________ 2) _________________
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This note was uploaded on 08/23/2009 for the course GEOL 102 taught by Professor Kennethsprenke during the Fall '09 term at Idaho.

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Topic%2002_Early%20Days - Early Days Read chapters 2, 3, 4...

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