Weathering and Soil

Weathering and Soil - Weathering and Soil Half life Time...

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Weathering and Soil 24/02/2008 18:32:00 Half – life: Time required for Radioisotopes Remaining      to Decay o Ex: 40 K turns into 40 Ar        # of   1000                                         Dark circle= # of Parent atoms Parent                                                open circle = # of daughter atoms Atoms 500 250                          D/P = 7      0       1       2      3      4          Time of Half lives     Closure Temperature – temperature below which decay products are retained Fission Tracks Reveal time elapsed since closure temperature  Weathering- the process of breaking down rock into movable pieces  Weathering and erosion work hand-in-hand Weathering is critical for Life on Earth Only small fraction of Earth’s land surface has bedrock
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Most of Earth’s land surface is covered by soil o The product of weathering o Ingredient of life Types of Weathering (physical and chemical weathering work together Chemical Weathering
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