Note%202%20Overview - Geology 101 Lecture 2 Planet Earth...

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Geology 101, Lecture 2 Planet Earth: Overview Back to the Geo101 HomePage Topics: -- Origin of Planet Earth -- The Earth as an Engine: Sources of Energy. * notice that the environment changes all the times. We have a lot of energy sources that act to change our landscape, our environments. -- Major Layers Within the Earth. -- Plate Tectonics * This is a more recent theory that explains a lot of features, rivers, volcanoes, etc. We'll cover this in more detail toward the end of the semester. Origin of Planet Earth View portion of "The Restless Planet" from the "Earth Revealed" video series The Earth as an Engine : Sources of Energy Solar heating Gravity -- drive the external (surficial) processes ( hydrological cycle, weathering, erosion, landslides, streams, etc.) Solar heating is the main affecter of the hydrologic cycle. Water from the liquid phase goes to the gas phase. As the vapors rise up to a higher height, they cool down and become more dense. Air mass is over saturated with tiny droplets of water. 100% of water in champaign is ground water. River erosion, higher relation, we can also have glacial ice. Landslide: mostly associated with gravity as source. Rainwater running down from the mountain to river. Gravity is a very important force that keeps things intact on the ground. Primordial heat Radiogenic heating from nuclear decay of radiogenic elements - If you at all the atoms we have on earth, only about 15% of the atoms on earth are stable. Most of the atoms have a nuclei that is unstable. There is a disintegration process. In order to reach a stable state, it starts to disintegrate. Alpha, beta, gamma particles.
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During this process, it releases a lot of heat. If you combine those particles, there is a slight mass difference between the parent and end product. e=mc^2. During this decay process a lot of heat can be generated. -- drive the internal (deep) processes (e.g., volcanism, plate tectonics) You have lots of tiny and tiny bits of material, getting bigger and bigger to planet size. When they contract and pull together, they create a lot of heat. Overtime, some of these will dispatch into the
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Note%202%20Overview - Geology 101 Lecture 2 Planet Earth...

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