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8th grade · Science · Unit 8 of 8

Space Systems

Moon phases, eclipses, seasons, gravity and scale.

What your child practices

Practices modeling the Earth-sun-moon system (phases, eclipses and seasons), the role of gravity in the solar system and galaxy, and the scale of objects in the solar system.

California Content Standards learning standard: MS-ESS1-1; MS-ESS1-2; MS-ESS1-3 · the Earth-sun-moon system, gravity in the solar system, and its scale

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Moon phases happen because…

    • clouds cover it
    • we see different amounts of the moon's lit half
    • Earth's shadow covers it
    • the moon makes its own light

  2. Question 2

    In June, California has long days because…

    • Earth is closest to the sun
    • the moon is full
    • the sun is bigger
    • the Northern Hemisphere tilts toward the sun

  3. Question 3

    Tides are caused mostly by…

    • earthquakes
    • fish
    • the moon's gravity
    • wind

  4. Question 4

    Which planet is closest to the sun?

    • Mars
    • Earth
    • Mercury
    • Venus

  5. Question 5

    Which is the largest planet?

    • Mercury
    • Jupiter
    • Earth
    • Mars

  6. Question 6

    A solar eclipse happens when…

    • Earth passes between the sun and moon
    • the sun passes behind Earth
    • the moon passes between the sun and Earth
    • the moon disappears

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