BIO 201 Lecture 9: Types of Rocks
7 Aug 2018
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Igneous: liquid rock that hardens when it cools. Sedimentary - formed from erosion of igneous rocks, biomineralization etc. sand, salt, clay cemented into rock (example: limestone, shale) Metamorphic - sedimentary rocks subjected to heat and pressure (marble, slate) cooked rock . Cycle - igneous - breaks up into sedimentary - subjected to heat and pressure - metamorphic - becomes magma - flows out through a volcano - igneous. Fossils are vaporized in igneous rocks (liquid rocks); fossils are melted or deformed by heat and pressure in metamorphic rock. Younger rocks layers are deposited over older rock layers. Used to perform radiometric dating - half life. Contain a large number of radioactive minerals. They constantly decay into more stable elements. The unstable element is known as the parent element, and the stable result of the decay is known as the daughter isotope. Amber cannot be directly dated using most radioisotopes.
