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Green Screen. Deposition of magnetic particles oriented towards the magnetic north pole. The method of reading the order is called stratigraphy layers of rock are called strata. Mind Read. Sedimentary layers: Coenraads, R.

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Layers of rock are deposited horizontally at the bottom of a lake principle of original horizontality.

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Dating Fossils – How Are Fossils Dated?

John Wiley and Sons This change is called radioactive decay. Petrified and permineralized fossils: Some of the most useful fossils for dating purposes are very small ones. The principle of faunal succession allows scientists to use the fossils to understand the relative age of rocks and fossils. Geologists also use other methods - such as electron spin resonance and thermoluminescencewhich assess the effects of radioactivity on the accumulation of electrons in imperfections, or "traps," in the crystal structure of a mineral - to determine the age of the rocks or fossils. The principle states that any geologic features that cut across strata must have formed after the rocks they cut through Figures 2 and 3.

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