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# Standard Indicater #1

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### Standard Indicater #1

1. 1. Earth’s Rotation Abby Baker 9/16/2009
2. 2. Standard 3 <ul><li>Indicator 4.3.8 – Explain that the rotation of the Earth on its axis every 24-hours produces the night-and-day cycle. </li></ul><ul><li>Taken from: http://dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx </li></ul><ul><li>Link to activity: http://www.indianastandardsresources.org/files/sci/sci_4_3_8.pdf </li></ul>
3. 3. Definitions <ul><li>Rotation – the movement or path of the earth or a heavenly body turning on its axis </li></ul><ul><li>Tilt – to cause to lean, incline, slope, or slant </li></ul><ul><li>Taken from : www.dictionary.com </li></ul>
4. 4. Pre-Activity <ul><li>Show the students a pencil, and tell them that it will represent the Earth’s axis. Wrap foil around the pencil in a ball and explain that the foil will represent Earth. </li></ul><ul><li>Select a student(s) to tilt and rotate the pencil, demonstrating how the Earth moves. </li></ul><ul><li>Tell the students they will be modeling the process of day and night. Ask these questions: </li></ul><ul><ul><li>How long is a full day? </li></ul></ul><ul><ul><li>What causes the night-and-day cycle? </li></ul></ul>
5. 5. Class Activity <ul><li>Show the students the globe and tell them it represents the earth. Help them identify the axis. (You can use a flashlight to represent the sun’s rays.) </li></ul><ul><li>Identify our continent, country, city, and state on the globe. </li></ul><ul><li>Turn the lights off and shine the flashlight on the piece of paper on the globe. </li></ul><ul><li>Ask students: “Is there light shining on out city/state right now?” </li></ul><ul><ul><li>“ What do you think will happen as I rotate the globe on it’s axis?” (slowly rotate the globe while holding the flashlight in the same spot) </li></ul></ul>
6. 6. Activity Continued <ul><li>Stop the globe when it is rotated halfway. Ask the students: </li></ul><ul><ul><li>“Now is there light shining on our city/state?” </li></ul></ul><ul><ul><li>Is the other side of the globe in the light or the dark?” </li></ul></ul><ul><ul><li>Discuss with the students that it takes 12 hours for the Earth to rotate halfway and it takes 24 hours for a full rotation. </li></ul></ul>
7. 8. Follow-Up Questions <ul><li>How many hours are there in one day? </li></ul><ul><li>If it is day/night in our city/state, is it daytime or nighttime in Australia? (have the students show how they know that with the globe) </li></ul><ul><li>How long does it take Earth to rotate on its axis? (How long does it take Earth to rotate halfway?) </li></ul>