ENV100Y5 Lecture Notes - Lecture 3: Acasta Gneiss, Carbonaceous Chondrite, Interstellar Cloud
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***reminder open and save due on friday september 23rd by 11:59pm. It(cid:859)s (cid:271)ette(cid:396) to u(cid:374)de(cid:396)sta(cid:374)d (cid:396)athe(cid:396) tha(cid:374) (cid:373)e(cid:373)o(cid:396)ize. Focus on basic concepts, processes, relationships and orders of magnitude instead of memorizing small details. Terminology is important small details (dates and names are not ball park it) Age of sun and solar system: ~4. 5 ga: based on models of stellar evolution and dating of primitive solar system objects. Age of earth: ~4. 54 ga: based on ages of terrestrial rocks and age of solar system and models of solar system formation. Oldest rock is ~4 ga old acasta gneiss. Nebular hypothesis (also called nebular theory or solar nebula model) The nebular hypothesis explains the origin of the solar system. Interstellar cloud inherits elements from previous generations of stars. In the solar system early history (solar nebula): High-temperature and high-pressure centre where the sun is: nuclear fusion begins in the centre where the sun is born.
