GEOG 1113 Lecture Notes - Lecture 2: Seismic Wave, Continental Crust, Radioactive Decay
Document Summary
Endogenic system encompasses internal processes that produce flows of heat and material from deep below earth"s crust (tectonics, earthquakes, and volcanism). Exogenic system involves external processes that set into motion air, water, and ice, all powered by solar energy (river, landforms, weathering, erosion, oceans, glaciers). The geologic time scale: eon (largest) >era>period>epoch (smallest) Holocene is the youngest epoch in the geologic time scale, characteristic of postglacial conditions since the retreat of the continental glaciers, about 11,500 years ago. Rock and sediment are always arranged with the youngest bed. Superposed toward the top of a rock formation and the oldest at the base, if they have not been disturbed. The sun and its solar system are estimated to have occurred more than 4. 6 billion years ago. How about the moon: earth is 4. 543 billion years old, moon is 4. 53 billion years old.
