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Earth, Moon & Sun

Earth, Moon & Sun. Seasons & Tides. Essential Standards. 6.E.1Understand the earth/moon/ sun system , and the properties, structures and predictable motions of celestial bodies in the Universe. Clarifying Objectives.

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Earth, Moon & Sun

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  1. Earth, Moon & Sun Seasons & Tides

  2. Essential Standards • 6.E.1Understand the earth/moon/sun system, and the properties, structures and predictable motions of celestial bodies in the Universe.

  3. Clarifying Objectives • 6.E.1.1 Explain how the relative motion and relative position of the sun, Earth and moon affect the seasons, tides, phases of the moon, and eclipses.

  4. Essential Questions • Why do we have seasons? • How does gravitational pull & location of the sun, moon & Earth affect the ocean tides?

  5. Earth’s Seasons • The Earth has 4 seasons • Summer • Winter • Autumn • Spring • THE EARTH HAS SEASONS BECAUSE OF ITS TILT ON ITS AXIS • The Earth is tilted at 23.5 degrees

  6. Northern Hemisphere vs. Southern Hemisphere • Northern Hemisphere is the part of the Earth that is above the Equator • The Southern Hemisphere is the part of the Earth that is below the Equator

  7. Northern Hemisphere vs. Southern Hemisphere • The closer you are to the Equator the less you will see season changes • The farther you are (North & South Pole) the more you will notice season changes

  8. Seasons are Opposite • Seasons are opposites in the Northern & Southern Hemispheres • The opposite seasons are • Summer/ • Spring/Autumn (Fall)

  9. Direct Sunlight vs. Indirect Sunlight • When a place on the Earth is receiving DIRECT SUNLIGHT it will be warmer meaning it will be SUMMER • When a place on the Earth is receiving INDIRECT SUNLIGHT it will be colder meaning it will be WINTER • http://www.youtube.com/watch?v=Pgq0LThW7QA • 3:16-4:50

  10. Seasons are Opposite • For example if it is summer above the equator (Northern Hemisphere) it will be winter below the equator (Southern Hemisphere) • Another example Autumn (Fall) above the equator/Spring below the equator

  11. Why Do We Have Seasons • Seasons exist because EARTH IS TILTED on it’s AXIS • The TILT on the Earth’s AXIS allows different parts of the Earth to receive more DIRECT sunlight • This allows the sun to hit at DIFFERENT ANGLES of the WORLD • http://www.youtube.com/watch?v=3eFqZWX8nTo • 0:00-2:00

  12. Seasons Model • http://www.youtube.com/watch?v=85jkZE2_oNg • http://www.youtube.com/watch?v=Pgq0LThW7QA • 2:03-

  13. Essential Question?? • Get with a partner or group and answer… • Why do we have seasons?

  14. Earth’s Tides • A TIDE is a rising and falling of the sea that happens 2 times per day • There are 2 types of tides • High Tide • Low Tide • http://www.youtube.com/watch?v=OP0cpXpw8yk

  15. Location of the Moon & Earth • Tides depend on the location of the moon & Earth • When the moon is directly over North America it will have High Tide • When the moon is directly on the opposite side of North America it will be low tide

  16. High Tide • High tide happens twice a day • It happens when the moon is directly above that spot on the earth • It also happens when the moon is directly below that spot on the earth • http://www.youtube.com/watch?v=Ead8d9wVDTQ

  17. Low Tide • Low tide happens twice a day • It happens when the spot being observed is at right angles to the moon • http://www.youtube.com/watch?v=Ead8d9wVDTQ

  18. What Causes Tides? • Tides are caused by • Moons Gravitational Force • Inertial Force

  19. Gravitational Force Pulls • Gravitational pull from the Moon causes water to rise above the land mass • This is called an ordinary High Tide • http://www.youtube.com/watch?v=ojPpxAT7Bh4 • 1:18-1:57

  20. Inertial Force • Inertial Force causes the second high tide on the back side of the moon • This is called a Counter High Tide • http://www.youtube.com/watch?v=ojPpxAT7Bh4 • 1:18-1:57

  21. Essential Question • Please get with a partner and answer…. • How does gravitational pull & location of the sun, moon & Earth affect the ocean tides?

  22. EOG Questions • Why does Earth have different seasons? • A) because of the distance between Earth and the sun • B) because of the speed of Earth as it rotates on its axis • C) because of the amount of light blocked by the moon on its axis • D) because of the tilt of Earth on its axis as it moves around the sun

  23. Important Points • Seasons occur because the Earth is TILTED on it’s AXIS • Seasons are opposite from North to South of the equator • Tides are when the ocean rises and falls • High Tide & Low Tide happens 2 times per day each • Ordinary Tides happen because of the Gravitational Force of the moon • Counter High Tides happen because of Inertial Force • If a tide is not in High tide it is in Low Tide • Tides depend on the position of the MOON & EARTH

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