Earth_Moon - The Earth and Its Moon Th E th Th M Th e Earth...

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Unformatted text preview: The Earth and Its Moon Th E th Th M Th e Earth Solid inner core, liquid outer core atmosphere - 50km thick magnetosphere charged The Moon Moon has no hydrosphere, atmosphere or magnetosphere same basic interior regions as magnetosphere - charged particles caught in Earths magnetic field same basic interior regions as Earth The Tides Earth is the only planet with large quantities of liquid water on the surface Most coastal locations experience 2 low and high tides each day what causes this? The moon pulls the water The moon also pulls the Earth This causes two bulges - one on the side facing th d th the moon and one on the opposite side where the water is left behind The moon is tidally locked tidally locked to the Earth - the same side of the moon is always facing us (moon rotation period is the same as its orbital period) Is there a side which is always dark? M Is there a side which we (on Earth) never see? Earth M M M Earths Atmosphere nitrogen (78%) oxygen (21% P t t th f oxygen (21%) argon (0.9%) carbon dioxide (0.03%) Protects the surface Regulates temperature Ozone absorbs UV Convection light Convection occurs here Convection Warmer air travels up and cooler air comes down to take its plac down to take its place Results in convection cells which heat the atmosphere creates surface winds and is responsible for most types of weather The Greenhouse Effect Sunlight not reflected by clouds reaches the Earths surface (about 50%) The heated earth re-radiates this light in the form of infrared radiation Infrared light is partially blocked by the Earths carbon dioxide (and water vapor) So, only part of the IR light goes into space, part goes back to earth The average Earth temperature is about 40K hotter because of greenhouse effect than it would be without it! Why is this important? Why does Earth retain its atmosphere...
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This note was uploaded on 10/19/2011 for the course AST 2037 taught by Professor Eikenberry during the Fall '08 term at University of Florida.

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Earth_Moon - The Earth and Its Moon Th E th Th M Th e Earth...

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