Unit 3

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Across
  1. 3. system,A collection of planets and celestial bodies orbiting the sun.
  2. 6. force,The force that occurs when two objects are in direct contact with each other.
  3. 7. resistance, The opposing force that slows down the motion of an object through a fluid.
  4. 12. periodic rise and fall of ocean waters caused by gravitational forces.
  5. 13. and trembling of the Earth's surface caused by tectonic plate movements.
  6. 14. central star of our solar system.
  7. 15. curved path an object takes as it revolves around another object.
  8. 16. massive celestial body that emits light and heat, sustaining life on Earth.
Down
  1. 1. capacity to do work or produce heat.
  2. 2. fall because of this force pulling them toward the Earth.
  3. 4. unit of measurement for energy in the International System of Units.
  4. 5. amount of matter in an object.
  5. 8. large celestial body that orbits the sun, Earth being one of them.
  6. 9. lines that run through the center of a planet, defining its rotation.
  7. 10. area devoid of matter, such as the one in space.
  8. 11. measure of the force of gravity on an object.