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 * 1) 64424066 HOME
 * 2) 64426754 17 Vocabuary
 * 3) 64490462 Ch 17 & 18 Kinestetic Exercises
 * 4) 64498166 17 Student Flow Charts
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 * 7) 65122758 chapter 18
 * 8) 98100964 linkforwarmup
 * 9) 98102812 SimulationProject
 * 10) 97826912 Tuesday 3-13-12 instructions

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 * [[image:rdt-meterology/ozone_molecule.jpg caption="Ozone Molecule 3 oxygens"]] ||
 * Ozone Molecule 3 oxygens ||

‍ozone destruction:



 * [[image:rdt-meterology/Layers_of_the_atmosphere.jpg caption="Layers of the atmosphere"]] ||
 * Layers of the atmosphere ||

‍two Earth motions


==‍**Rotation of the Earth:** The Earth orbits around the Sun. It takes one year to go around the Sun one complete time. The Earth also rotates, or spins, on its axis. It takes one day to spin around itself one complete time. The Earth's axis is not straight up and down, but tilted at an angle of 23.5 degrees. The rotation is what causes the change from day to night. This tilt is responsible for having seasons. If the Earth were not tilted, we would have the same season all year long. == 

==‍**Revolution of the Earth:**  The movement of the Earth around the Sun in a fixed orbit is called as revolving. One full orbit around the sun is one revolution. The Earth takes 365 days or 1 year to complete one revolution. The Earth revolves around the Sun because of gravity. The Earth really rotates 365 ¼ times during each revolution. The calendar always has 365 days, after every 4 years, the earth has made one extra rotation. How ever, one extra day is added to the month of February once in every four years forming a leap year with 366 days. ==