TEKS 8.7A Reason for the Seasons

Seasons: Watch the video and fill in the blanks in the summary below. The Earth is spinning around an imaginary line called its axis. The axis passes through the north pole and south pole. The reason for day and night is that the Earth is rotatingaround its axis. As the Earth spins about its axis it revolvesaround the Sun on its orbit path. So, to summarize each time the Earth rotates around its axis 1 dayhas been completed and every time the Earth completes one revolution 1 yearhas been completed. One day is 24 hours long and one year is 365.25days long. The Earth is tiltedon its axis so that the north and south pole are not straight up and down, but slanted at an angel of 23.5degrees. Because of this tilt the amount of direct sunlight received at different points on the Earth changes throughout the year. This is why we have seasons. As the Earth revolves around the sun the angle of solar radiation changes for different parts of the world. When the northern hemisphere experiences summer the southern hemisphere experiences winter. How long does it take Earth to rotate on its axis? 24 hours 12 hours It depends on the time of year. a year In the diagram below which number represents the position of the Earth during Winter in the Southern Hemisphere? 1 2 3 4 In the diagram below which numbers represent Spring and Fall? 1 2 3 4 2 4 1 3 In the diagram below what season is it Summer in the Southern Hemisphere? 1 2 3 4 Solar Radiation Use the diagram above to fill in the blanks below. This drawing shows summerin the Southern Hemisphere and winter in the Northern Hemisphere. During the equinoxes, the most intense solar radiation is at the equator.This zone of direct sunlight is known as the tropics. However, even in summer at the North and South Poles, it is colder than the equator. This is because the solar radiation at the poles is less direct and therefore, more spread out, and at the equator, the sunlight hits the Earth more direct and therefore, more concentrated. Matching Summer when Earth is tilted Towards from the Sun therefore receiving direct rays from the Sun Rotation the time it takes Earth to spin on its axis Revolution the time it takes Earth to go arond the Sun Northern Hemisphere Top half of the Earth Equator The middle line of latitude. Winter when Earth is tilted Away from the Sun therefore receiving indirect rays from the Sun Southern Hemisphere Bottom half of the Earth Label the seasons accordingly: summer, fall, spring, winter *DO NOT USE CAPITAL LETTERS USE CORRECT SPELLING! winter summer winter summer spring fall fall spring