BIOL 215 Lecture Notes - Lecture 2: Magnetite, Allan Hills 84001, Infrared Spectroscopy
Document Summary
Protostars burn and produce heavier elements such as iron. Protostar explodes as supernova and forms our solar system about 4. 6 bya. Sun is created which is essential to the beginning of life. Earth is in a perfect location orbiting around the sun where its not too cold nor too hot. Earth was originally molten; mostly made up of iron, magnesium, silicon, and oxygen. Earth only cooled (formed crust) around 4. 2-4. 1 bya. Both igneous rocks and sedimentary rocks metamorphosis >metamorphic rocks which can melt back into magma. Can calculate how old minerals are (ie. date of birth of stars and earth) using the radioactive decay of uranium into lead and its half life with how much lead is present or uranium is remaining. Fossils in upper strata most likely living organisms. Meteors and comets bombarded earth 4. 5-3. 8 bya (supply lighter elements and frozen gases) Atmosphere generated by volcanic out gassing (80%) and impact bodies (20%)
