Chapter 1 Section 2 Phases, Eclipses, and Tides Objective: Students will define phase, eclipse, and...
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Transcript of Chapter 1 Section 2 Phases, Eclipses, and Tides Objective: Students will define phase, eclipse, and...
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?
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.
Moon Phases
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.
Solar and Lunar Eclipses
• 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
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.
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.
Spring and Neap Tides
• 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.
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?
Homework for Tonight
• Page 45 – Key Terms for Chapter 1 Section 2– Read the Key ideas for Section 2