EARTH 20 Lecture Notes - Lecture 2: Biogeochemical Cycle, Geologic Hazards, Rock Cycle
Document Summary
We do not have more earthquakes or volcanoes, but we have more populated areas due to increasing population of the world. Most expensive events typically caused by storms and occurred in u. s, europe and japan. Because they are the wealthiest economies on earth. It can take years for total dollar losses to be known. Ex: haiti still hasn"t recovered from their 2010 m7 earthquake because their structures were not meant to withstand these disasters. Geology determines type, location, and intensity of natural processes and geologic hazards. Creation, destruction, and movement of tectonic plates. Driven by forces within earth (internal energy) 46,000 gigawatts coming from inside the earth. Igneous rocks: form from crystallization of magma or lava. Sedimentary rocks: rocks are weathered into sediment by wind, water, or ice. Metamorphic rocks: rocks changed through extreme heat, pressure, or chemically active fluids. Biogeochemical cycle: transfer of chemical elements through a series of reservoirs.
