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Unformatted text preview: The Seasons and Day and Night Physical processes powered by incoming radation from sun Direction of Earths axis is fixed Solstice= N pole tilted away or towards o Winter Dec. 22 o Summer June 21 o At noon sun is at an angle Equinox= Earths axis makes r. angle w/ line drawn to sun, neither pole tilted to sun o At noon sun is directly overhead Length of day varies depending on lat and long b/c of Earths tilt Heat= energy of motion of molecules and atoms in a substance 3 way to transfer heat: o Radiation- electromagnetic waves o Conduction- contact o Convection- upward mvmt of warm air or liquid Radiaton= everything above 0 Kelvin emits radiation and moves o Electromagnetic spectrum o Short wavelength= high energy, hazardous (Gamma and X) o UV= damaging to living tissue o Visible= see o NIR= reflected by plants o Thermal IR= heat o Warmer object= shorter wavelength emitted & greater amount of radiation o Solar: Suns EMR that passes through atmosphere reflected by Earths surface and atmosphere Suns surface emits much more radiation than anything on Earth...
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- Spring '08