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eath science vocab

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Across
2.Length of time for half of an element's atoms to decay.
5.Swamps form; coal begins to develop. (2 Words)
10.outline of the events of the eart's history (3 Words)
11.The Great Lakes Form after the last ice age. (2 Words)
14.in layers of sedimentary rocks, the oldest layer is on the bottom and the youngest layer is on the top of the layers have not been overturned (3 Words)
15.Method that determines the actual age of a fock or fossil (2 Words)
16.Preserved remains of an organism.
Down
1.A feature,souch as a fock structure of a fault, that cuts across rock layers is younger than the rock layers (4 Words)
3.All the time that has passed since the eart formed. (2 Words)
4.element that breaks apart, or decays, to form another element (2 Words)
6.space left in a rock where an organism was burried.
7.minerals replace a buried organism.
8.Method that compares two rock layers to find out which one is older (2 Words)
9.when minerals fill a mold.
12.fossil tat can be used to establish the relative age of the rock in whih the fossil occurs (2 Words)
13.The Rocky Mountians form. (2 Words)
14.The earth's crust and mantle form. (2 Words)

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