CHAPTER III EARTH AS A PLANETARY BODY Ch III Planet Earth Read 3 1 up to Geologic Time PLANET EARTH Earth is Flat Earth is Spherical Earth is an Oblate Spheriod Geoidal bulge centrifugal pull caused by earth s rotation Earth s Magnetic Field Why Earth s Magnetic Shield Matters SOLAR ENERGY FROM SUN TO EARTH Auroras Charged particles of the solar wind interact with Earth s magnetic field magnetosphere and are deflected toward the poles Alexander Gerst s Earth timelapses Earth s Rotation Counterclockwise when viewed from above the north pole West to east when viewed with the north pole up REVOLUTION EARTH S DISTANCE FROM THE SUN DOES NOT CAUSE SEASONAL CHANGES REASONS FOR SEASONS Revolution Earth revolves around the Sun Voyage takes one year Earth s speed is 107 280 kmph 66 660 mph Rotation Earth rotates on its axis once every 24 hours Rotational velocity at equator is 1674 kmph 1041 mph Rotational velocity at 60 is 838 kmph 521 mph Rotational velocity at the poles is 0 https youtu be mPsLanVS1Q8 THE AXIS OF ROTATION Axis is tilted 23 5 from plane of ecliptic Influences amount of radiation SPHERICITY Oblate spheroid is lit by Sun s parallel rays Earth s revolution in orbit around the Sun 365 25 days to complete Daily rotation 24 hours to complete Tilted axis aligned 23 5 degree angle Connects N and S Poles Sphericity Oblate Spheriod lit by Sun s parallel rays Sphericity LATITUDE LATITUDE LATITUDE INSOLATION AT TOP OF ATMOSPHERE INSOLATION AT TOP OF ATMOSPHERE TROPICS SOLSTICES ARCTIC ANTARCTIC EQUINOXES ANNUAL MARCH OF THE SEASONS THE END
View Full Document
Unlocking...