BIOLOGY 1A03 Lecture : biology

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BIOLOGY 1A03 Full Course Notes
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BIOLOGY 1A03 Full Course Notes
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Chapter 21: the history of life on earth. The oldest layers, or strata, lie at the bottom, and successively higher strata are progressively younger: observations of fossils contained within sedimentary rocks: Radioisotopes provide a way to date rocks: half of the remaining radioactive material of the radioisotope decays. Radioisotope dating have been expanded and refined: the decay of potassium-40 to argon-40 has been used to date most of the ancient events in the evolution of life. Fossils in the adjacent sedimentary rock that are similar to those in other rocks of known ages provide additional clues: radioisotopes dating of rocks, combined with fossil analysis, are the most powerful method of determining geological age. 21. 2 how have earth"s continents and climates changed over time: earth"s crust consists of a number of solid plates approximately 40km thick, collectively make up the lithosphere.

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