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Another pattern on Earth is our sequence of ? Seasons… four.

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Presentation on theme: "Another pattern on Earth is our sequence of ? Seasons… four."— Presentation transcript:

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2 Another pattern on Earth is our sequence of ? Seasons… four

3 Patterns in Nature During summer, – daylight is longer and the weather is often warmer. During summer, – daylight is longer and the weather is often warmer. During winter, – daylight grows shorter and the weather become colder. During winter, – daylight grows shorter and the weather become colder. For thousands of years, people have taken careful notice of the seasons so that they know the best time to plant their crops.

4 What Causes the Seasons to Change? The Earth orbits, or revolves, around the Sun at the same time that it rotates on its axis. Revolution or orbits- takes one year to happen. REMINDER: New Years Resolution happens once a year just like it takes the Earth one year for to orbit, or make one revolution around the Sun. It takes one year- just over 365 days- for the Earth to complete one orbit around the Sun. 1 rotation = 24 hours or 1 day 1 orbit around the Sun= 365 days

5 The four seasons are actually caused by Earths tilt on its axis as it orbits the Sun. Part of the Earth is always tilting towards the Sun. The opposite side of Earth is tilting away. Because of this tilt, the Suns rays hit us more directly in summer than in winter. Because the Suns rays are more direct in the summer, the days are longer and temperatures are warmer. Shadows are shorter. In the winter, the opposite is true. The Suns rays are less direct. Days are shorter, temperatures are cooler, and shadows are longer.

6 When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. – This is because the Southern Hemisphere then tilts away from the sun and receives less direct sunlight. Months later, when it is summer in the Southern Hemisphere, it will be winter in the Northern Hemisphere. le=../Grade4/Chapter8-EarthRevolvesAroundTheSun/ NH = Winter NH = Summer Equator

7 SummerWinter Fall Spring

8 Four Season Notes Earth orbits the sun once every 365 ¼ days ( days) Earths tilt on its axis gives us our four seasons: spring, summer, fall, winter. Because of Earths tilt, the suns rays hit more directly in summer than winter. Days are longer and warmer in the summer. Shadows are shorter. When its summer in the Northern Hemisphere, its winter in Southern Hemisphere.


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