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Phases of the Moon
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  • Slide 1
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    Phases of the Moon

    Body text
  • Slide 2
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    Sun, Moon, and Earth

    • The moon does not produce its own light

    • Sunlight reflects off the moon's surface

    • Gravity between the moon and Earth keeps the moon in its orbit

    • The moon does not crash into Earth because it stays in its orbit and moves.

    • The moon makes a complete trip around Earth in about 27.3 days.

    • The same side of the moon is always facing Earth. That is the only side you can see from Earth.

  • Slide 3
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    Phases of the Moon

    • The moon's shapes appears to change at different times throughout the month.

    • Half of the moon faces the sun, and sunlight is reflected from the surface of that half.

    • When the lighted half of the moon directly faces Earth, the moon appears as a full circle of light. That's a full moon.

    • We only see a full moon briefly each time the moon revolves around the Earth.

    • All the moon's shapes are called the phases of the moon.


  • Slide 4
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    The Sun, the Moon, and the Tides

    • Tides-the rise and fall of the ocean along the coasts

    • The main cause of the tides is the gravitational pull of the sun and moon on Earth's oceans.

    • The moon has a much greater effect on the tides because it is closer to Earth.

    • The moon's gravity pulls on the ocean and forms a bulge of water on the side facing the moon

    • This bulge of water is high tide.

    • The moon pulls more weakly on the far side of the Earth, which faces away from Earth. This creates a second bulge, which is another high tide.

  • Slide 5
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    Frequency of Tides

    • While the water is pulled into bulges in some places, it is drawn away in other places.

    • These are low tides.

    • You can think of them as dips in the water.

    • As Earth rotates, different parts pass through the bulges and dips.

    • The result is that tides rise (high tide) and fall (low tide) twice a day in most coastal areas.

    • About 6 hours after a high tide, there will be a low tide. Then about 6 hours later, high tide again.

  • Question 6
    30 seconds
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    Q.

    The moon has its own light.

    answer choices

    True

    False

  • Question 7
    30 seconds
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    Q.

    Where does the moon's light come from?

    answer choices

    Earth

    Mars

    Sunlight reflects off the moon's surface

  • Question 8
    30 seconds
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    Q.

    What keeps the moon in its orbit?

    answer choices

    The sun's gravity

    Itself

    Gravity between the moon and Earth

  • Question 9
    30 seconds
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    Q.

    About how long does it take the moon to complete a trip around Earth?

    answer choices

    1 year

    6 months

    2 days

    27.3 days

  • Question 10
    30 seconds
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    Q.

    What is called when the lighted half of the moon directly faces Earth?

    answer choices

    full moon

    half moon

    crescent moon

  • Question 11
    30 seconds
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    Q.

    All the moon's shapes are called the phases of the moon.

    answer choices

    True

    False

  • Question 12
    30 seconds
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    Q.

    A high tide happens when....

    answer choices

    The moon's gravity pulls on the water and makes a bulge on the side facing the moon.

    The moon's gravity pulls weakly on the ocean.

  • Question 13
    30 seconds
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    Q.

    What are dips in the water in the ocean?

    answer choices

    High tide

    Low tide

  • Question 14
    30 seconds
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    Q.

    About how often do high and low tides occur?

    answer choices

    once a day

    once a week

    once a month

    every 6 hours

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