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Lecture 1 Notes

Others included nitrogen n2 the most abundant gas in

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Unformatted text preview: tmosphere, carbon dioxide (CO2), and hydrochloric acid (HCl), which was the source of the chloride in sea salt (mostly NaCl). The volatiles were probably released early in the Earth's history, when it melted and segregated into the core, core, mantle, mantle, and crust. This segregation occurred because crust. of differences in density, the crust being the "lightest" material. Volcanoes have released additional volatiles throughout the Earth's history, but probably more during the early years when the Earth was hotter. Probably, the oceans formed as soon as the Earth cooled enough for water to become liquid, about 4 billion years ago. The oldest rocks on the earth's surface today are 3.8 billion years old. Outgassing Oceans are byproducts of heating and differentiation: as earth warmed and partially melted, water locked in the minerals as hydrogen and oxygen was released and carried to the surface by volcanic venting activity Origin of Atmosphere Atmosphere evolved in 4 steps: primordial gases, later lost from sun's radiation exhalations from the molten surface (volcanic venting); bombardment from icy comets steady additions of carbon dioxide, water vapor, carbon monoxide, nitrogen, hydrogen, hydrogen chloride, ammonia, and methane from volcanic activity addition of oxygen by plant/bacterial life The Hydrologic Cycle Water occurs as a solid, liquid and gas Amount of water is fixed The places where water resides are called Water constantly moves from one reservoir...
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