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Unit 3 The Earth-Moon-Sun System

Unit 3 The Earth-Moon-Sun System. The Big Idea : Earth & the moon move in predictable ways & have predictable effects on each other as they orbit the sun. Unit 3 Lesson 1 Earth’s Days, Years, and Seasons. Spinning in Circles.

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Unit 3 The Earth-Moon-Sun System

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  1. Unit 3 The Earth-Moon-Sun System The Big Idea: Earth & the moon move in predictable ways & have predictable effects on each other as they orbit the sun.

  2. Unit 3 Lesson 1 Earth’s Days, Years, and Seasons Spinning in Circles • Rotation- the spinning of a body, such as a planet, on its axis(called a day) • Earth rotates counterclockwise • Earth rotates west to east • Only ½ of Earth faces the sun

  3. Unit 3 Lesson 1 Earth’s Days, Years, and Seasons • Revolution- the motion of a body that travels around another body in space • Earth revolves the sun in 365 ¼ days

  4. Unit 3 Lesson 1 Earth’s Days, Years, and Seasons Tilt-a-Whirl • Earth is titled at 23.5˚

  5. Unit 3 Lesson 1 Earth’s Days, Years, and Seasons Seasons change… • Seasons – a specific time of the year that is characterized by recurring weather conditions • Equinox- sun shines equally on both hemispheres • Solstice- area of sunlight is maximum in one hemisphere & minimum in the other

  6. Unit 3 Lesson 1 Earth’s Days, Years, and Seasons

  7. Unit 3 Lesson 2 Moon Phases and Eclipses Round and Round They Go! • Moon – natural satellite that travels around planets (revolution 28.5 days) • Gravity – force that pulls all bodies that have mass toward other objects. http://www.nasa.gov/audience/forstudents/brainbites/nonflash/bb_home_moonrotation.html

  8. Unit 3 Lesson 2 Moon Phases and Eclipses It’s Just a Phase! http://www.freewebs.com/rachelkalin/apps/photos/photo?photoid=6917256

  9. Unit 3 Lesson 2 Moon Phases and Eclipses Exploring Eclipses • Eclipse – an event during which one object in space casts a shadow on another object • Umbra – darkest part of a shadow • Penumbra – around the umbra a spreading cone of lighter shadow

  10. Unit 3 Lesson 2 Moon Phases and Eclipses Lunar Eclipse • Lunar eclipse occurs when the moon moves through Earth’s shadow

  11. Unit 3 Lesson 2 Moon Phases and Eclipses Solar Eclipse • When the moon is directly between the sun and Earth, the shadow of the moon falls on “part” of Earth http://www.total-eclipse-2008.com/eclipse/geometry.php

  12. Unit 3 Lesson 3 Earth’s Tides A Rising Tide of Interest • Tides – daily changes in the level of ocean water due to the difference in the gravitational force of the sun and mostly moon across Earth

  13. Unit 3 Lesson 3 Earth’s Tides Tide Me Over • Spring Tides – have the largest daily tidal range, happens when the sun, moon, & Earth form a straight line.

  14. Unit 3 Lesson 3 Earth’s Tides • Neap Tides – smallest daily tidal range, happen when the sun, moon, & Earth form a 90˚ angle.

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