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?: 24

3. What part of the atom orbits the nucleus?: Electron

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?: Molten

7. Which French scientist used a pendulum to help confirm Earth's movement: Foucault, Einstein, Newton, or Galileo?: Foucault

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.: Earth

11. In the geocentric model of the universe, everything in the heavens revolves around ___.: Earth

12. How long does it take Earth to make a complete rotation on its axis?: 1 day

13. March 20^th is associated with the ___.: Vernal equinox

14. Earth has seasons, because its axis of rotation is tilted at ___ degrees to the orbital plane.: 23.5

15. The time when daylight and nighttime hours are exactly equal is called the ___.: equinox

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