1. Rock Development II: Relative and Absolute Dating mirjam nilsson
2. A) Dispose how layers of rocks (stratified rocks) are formed, B) Person the different methods (relative settle down absolute dating) to determine goodness age of stratified rocks, prep added to C) Explain how relative move absolute dating were used back up determine the subdivisions of geological time. Objectives
3. 20XX bestowal title 3 The relative have power over of a rock is closefitting age when compared with decency ages of other rocks Representation absolute age of a shake is a calculation of high-mindedness number of years that plot passed since the rock watchful.
4. How Layers of Rocks Are Formed
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6. . 20XX presentation title 6 How Sediments are formed and sediments second-hand goods turned into layers of spanking rocks. Existing rocks can put right broken down into small start called ________. 3 Main types of Weathering: 1.___________ - caused by temperature changing. 2. __________ - when acid rain reacts with substances in rocks. 3. __________ - plants or animals can break up rocks.
7. Sediments can be move spirit by: _______, ______, ______, ______. The combined process of away and transport is called ________. When sediments settle in balmy place and some may fall at the bottom of honesty sea and this called _______. _______ when these layers nobleness weight of the layers overthrow compressed the ones below endure are formed into sedimentary rocks. _________when substance sips between picture sediments and hardened and at one`s wits` end together. 20XX presentation title 7
8. Methods to Determine rectitude Age of Stratified Rocks Associated dating is a method govern arranging geological events based continual the rock sequence. • Final which fossils or events came first, second, third…etc… 20XX monitor title 8
12. Absolute Dating – determining the actual search of rock using radioactive dwindle 20XX presentation title 12
13. • ABSOLUTE DATING the occasion of determining an age entirely a specified chronology in anthropology and geology (RADIOACTIVE DECAY) • RELATIVE DATING the process leverage determining if one rock annihilate geologic event is older on the other hand younger than another, without indicative their specific ages (GEOLOGIC SEQUENCING) 20XX presentation title 13
14. PRINCIPLES OF RELATIVE DATING • Law of Superposition States roam each layer of sediment progression piled on top of recourse layer making the one market top of the strata prestige youngest one, while the row at the bottom of excellence strata is the oldest.
16. The Law of Cross-Cutting Bond • States that igneous ringement is always younger than rectitude rock it cuts across • Extrusion – a lava desert is cooled and hardened fragment a surface. • Intrusion – a magma that is cooled and hardened beneath the horizontal (hardened magma)
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19. The Oversight of Inclusion • The rocks that are mixed up mull it over the formation of sediments hurtle called INCLUSION • These rocks are always older than position layer of sediments it pump up embedded. 20XX presentation title 19
20. Law of Horizontality • Layers of sediments are in the early stages deposited horizontally under the power of gravity. Those strata's wind are not found not envelop horizontal order may have antique deformed by the movement epitome the earth’s crust. 20XX award title 20
21. Absolute Emphasize of Rocks • RADIOMETRIC DATING – radioactive isotopes found manner fossils or rocks are lax. 20XX presentation title 21
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23. • Radioactive decay – ethics process by which an initesimal nucleus of an unstable iota loses energy. Alpha, Beta unthinkable Gamma • The original variable isotope is called the father isotope, and the more strong form is called the girl isotope. Isotopes decay at unsullied exponential rate that that get close be described in terms be keen on half-life. • Half – convinced - it takes time financial assistance substance undergoing decay to reduce by half. 20XX presentation honour 23