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Chapter 1 Section 2 Phases, Eclipses, and Tides

Chapter 1 Section 2 Phases, Eclipses, and Tides. Objective: Students will define phase, eclipse, and tide. Star Log: #2 What does “phases of the moon” mean?. Phases of the Moon. The positions of the moon, Earth, and the sun cause the phases of the moon, eclipses, and tides.

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Chapter 1 Section 2 Phases, Eclipses, and Tides

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  1. Chapter 1 Section 2Phases, Eclipses, and Tides Objective: Students will define phase, eclipse, and tide. Star Log: #2 What does “phases of the moon” mean?

  2. Phases of the Moon • The positions of the moon, Earth, and the sun cause the phases of the moon, eclipses, and tides. • The phase of the moon you see depends on how much of the sunlit side of the moon faces Earth.

  3. Moon Phases

  4. Moon Facts • The moon does not have it’s own light, it reflects light from the sun. • The amount of the sunlit side of the moon that you can see determines its phase. • The moon goes through a whole set of phases about once a month.

  5. Solar Eclipse A solar eclipse occurs when the moon passes between the Earth and the sun, blocking the sunlight from reaching the Earth. Lunar Eclipse A lunar eclipse occurs at a full moon when Earth is directly between the moon and the sun. Solar and Lunar Eclipses

  6. Solar and Lunar Eclipses

  7. What is a tide? • A tide is the rise and fall of water every 12.5 hours. • The water rises for about 6 hours and then falls for about 6 hours.

  8. What causes the tides? • The force of the gravity pulls the moon Earth (especially the water on Earth’s surface) toward each other. • Tides occur mainly because of differences in how much the moon pulls on different parts of the Earth.

  9. Spring Tides Once a month, at a new moon, the sun, Earth, and moon are nearly in a line. The gravity of the sun and moon pull in the same direction causing a tide with the greatest difference between low and high tide. Neap Tides Twice a month when the Earth and sun are at right angles to line between the Earth and moon. The sun and moon pulling in these directions causes a tide with the least difference between low and high tide. Spring and Neap Tides

  10. Class Review • Why does the moon change its phases as the month progresses? • Why are a day and a year on the moon the same length?

  11. Homework for Tonight • Page 45 • Key Terms for Chapter 1 Section 2 • Read the Key ideas for Section 2

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