What are the two engines that drive earth's processes, how do they work (basically) and what...

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What are the two "engines" that drive earth's processes, how do they work (basically) and what are their energy sources? How do the "engines" influence and interact with the Earth Systems? (provide a couple of examples) In "Environmental Geology 1.1 - Delivering Alaskan Oil - The Environment vs. the Economy", the USGS recommended against the construction of the Alaska pipeline partially because of the Geologic hazards along the route. What were some of the hazards noted, and what design features did the engineers use to minimize the impact of these hazards? In "In Greater Depth 1.3 - Geology as a Career", what are some of the disciplines of Geology and what do they do? What are the two "engines" that drive earth's processes, how do they work (basically) and what are their energy sources? How do the "engines" influence and interact with the Earth Systems? (provide a couple of examples) In "Environmental Geology 1.1 - Delivering Alaskan Oil - The Environment vs. the Economy", the USGS recommended against the construction of the Alaska pipeline partially because of the Geologic hazards along the route. What were some of the hazards noted, and what design features did the engineers use to minimize the impact of these hazards? In "In Greater Depth 1.3 - Geology as a Career", what are some of the disciplines of Geology and what do they do?