UNIT ONE: Toward Independence Lesson 31
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UNDERSTANDING THE SEASONS

 LEFT SIDE PAGE 68 1 WARM-UP! What causes the change in the seasons?           3 BrainPop "Seasons" Online Video and Quiz 4 Attach Reading on Understanding the Seasons. CLICK HERE to Download a Copy of the Reading. 4 Copy the diagram of the Earth's revolution around the Sun. Label and explain each position. CLICK HERE to Download a Copy of the Diagram.
 RIGHT SIDE PAGE 69               2 OBJECTIVE: Explain why the seasons occur.                                                     5 Attach Handout on Understanding the Seasons. The seasons are the result of the __TILT__ of the Earth's axis. The imaginary line around which the Earh rotates is the __AXIS__. The angle of the Earth's tilted axis is __23 1/2__ degress from its orbit around the Sun At the same time the Earth is rotating, it is traveling around the Sun.  One complete orbit of the Earth around the Sun is called a __REVOULTION__. As the Earth revolves around the Sun, its axis always __POINTS TO SAME PLACE, THE NORTH STAR__. If the axis of the Earth was not tilted but perpendicular to its orbit, a person standing at the same location would NEVER or ALWAYS see a change in the noontime altitude of the Sun and the seasons. Hold a flashlight at various angles to a wall, keeping the distance of the beam to the wall the same.  In order to make the light fall over the smallest area, how must the beam be directed toward the wall?  __PERPENDICULAR TO THE WALL__. The smaller the angle of the beam striking the wall, the LARGER or SMALLER the area will be illuminated. The energy source of the flashlight is the same, no matter how the beam is directed toward the wall.  But the energy falling upon the wall per unit area varies due to the __ANGLE__ at which the beam hits the wall. The same can be said for the angle at which the Sun's energy strikes the Earth.  The angle of the sunlight striking the Earth's surface depends on the Earth's __TILTED AXIS__.