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3.8: Planet Earth- Challenge 1

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    1. A nucleus contains which particle(s)?
    Protons and neutrons
    2. If the number of protons of a neutral atom is 24, how many electrons does it have?
    3. What part of the atom orbits the nucleus?
    4. Earth's magnetic field ___.
    has changed direction in the past
    5. What generates Earth's magnetic field?
    Convection in the liquid outer core
    6. Which form of iron and nickel generates a magnetic field in the outer core of the earth?
    7. Which French scientist used a pendulum to help confirm Earth's movement: Foucault, Einstein, Newton, or Galileo?
    8. Earth's rotational speed is about ___.
    1,700 km/hour
    9. Apparent shifts in the swing of a Foucault pendulum is the best evidence for the idea that ___.
    Earth spins on its axis
    10. According to the geocentric model, ___ is at the center of the universe.
    11. In the geocentric model of the universe, everything in the heavens revolves around ___.
    12. How long does it take Earth to make a complete rotation on its axis?
    1 day
    13. March 20th is associated with the ___.
    Vernal equinox
    14. Earth has seasons, because its axis of rotation is tilted at ___ degrees to the orbital plane.
    15. The time when daylight and nighttime hours are exactly equal is called the ___.

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